[cleanup] Remove --stress-opt remnants

.. mostly mentions in mjsunit `Flags:` lines and in comments.

Bug: v8:10386
Change-Id: If79dfdc448d0a3f19883ef1f816e77e750cb4061
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3865964
Commit-Queue: Jakob Linke <jgruber@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82852}

test/debugger/debug/debug-evaluate-dead-function-fails.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --no-always-turbofan --no-stress-opt
+// Flags: --no-always-turbofan
 
 Debug = debug.Debug
 

test/debugger/debug/debug-evaluate-locals-capturing.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --no-always-turbofan --no-stress-opt
+// Flags: --no-always-turbofan
 
 Debug = debug.Debug
 var exception = null;

test/debugger/debug/debug-evaluate-modify-catch-block-scope.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --no-always-turbofan --no-stress-opt
+// Flags: --no-always-turbofan
 
 Debug = debug.Debug
 

test/debugger/debug/regress/regress-crbug-171715.js

@@ -25,7 +25,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --no-always-turbofan --no-stress-opt
+// Flags: --no-always-turbofan
 
 Debug = debug.Debug
 

test/inspector/debugger/tdz-modules-scopes.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --no-stress-opt --no-always-turbofan
+// Flags: --no-always-turbofan
 
 let {session, contextGroup, Protocol} =
     InspectorTest.start('Test module scope with variables in TDZ.');

test/inspector/debugger/tdz-scopes.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --no-stress-opt --no-always-turbofan
+// Flags: --no-always-turbofan
 
 let {session, contextGroup, Protocol} =
     InspectorTest.start('Test scopes with variables in TDZ.');

test/mjsunit/asm/asm-validation.js

@@ -5,10 +5,7 @@
 // Flags: --validate-asm --allow-natives-syntax
 
 // Note that this test file contains tests that explicitly check modules are
-// valid asm.js and then break them with invalid instantiation arguments. If
-// this script is run more than once (e.g. --stress-opt) then modules remain
-// broken in the second run and assertions would fail. We prevent re-runs.
-// Flags: --no-stress-opt
+// valid asm.js and then break them with invalid instantiation arguments.
 
 function assertValidAsm(func) {
   assertTrue(%IsAsmWasmCode(func));

test/mjsunit/compiler/call-with-arraylike-or-spread-2.js

@@ -4,10 +4,10 @@
 
 // Flags: --allow-natives-syntax --turbo-optimize-apply --turbofan
 
-// These tests do not work well if this script is run more than once (e.g.
-// --stress-opt); after a few runs the whole function is immediately compiled
-// and assertions would fail. We prevent re-runs.
-// Flags: --nostress-opt --no-always-turbofan
+// These tests do not work well if this script is run more than once; after a
+// few runs the whole function is immediately compiled and assertions would
+// fail. We prevent re-runs.
+// Flags: --no-always-turbofan
 
 // These tests do not work well if we flush the feedback vector, which causes
 // deoptimization.

test/mjsunit/compiler/call-with-arraylike-or-spread-3.js

@@ -3,11 +3,7 @@
 // found in the LICENSE file.
 
 // Flags: --allow-natives-syntax --turbo-optimize-apply --turbofan
-
-// These tests do not work well if this script is run more than once (e.g.
-// --stress-opt); after a few runs the whole function is immediately compiled
-// and assertions would fail. We prevent re-runs.
-// Flags: --nostress-opt --no-always-turbofan
+// Flags: --no-always-turbofan
 
 // These tests do not work well if we flush the feedback vector, which causes
 // deoptimization.

test/mjsunit/compiler/call-with-arraylike-or-spread-4.js

@@ -3,11 +3,7 @@
 // found in the LICENSE file.
 
 // Flags: --allow-natives-syntax --turbo-optimize-apply --turbofan
-
-// These tests do not work well if this script is run more than once (e.g.
-// --stress-opt); after a few runs the whole function is immediately compiled
-// and assertions would fail. We prevent re-runs.
-// Flags: --nostress-opt --no-always-turbofan
+// Flags: --no-always-turbofan
 
 // These tests do not work well if we flush the feedback vector, which causes
 // deoptimization.

test/mjsunit/compiler/call-with-arraylike-or-spread-5.js

@@ -3,11 +3,7 @@
 // found in the LICENSE file.
 
 // Flags: --allow-natives-syntax --turbo-optimize-apply --turbofan
-
-// These tests do not work well if this script is run more than once (e.g.
-// --stress-opt); after a few runs the whole function is immediately compiled
-// and assertions would fail. We prevent re-runs.
-// Flags: --nostress-opt --no-always-turbofan
+// Flags: --no-always-turbofan
 
 // These tests do not work well if we flush the feedback vector, which causes
 // deoptimization.

test/mjsunit/compiler/call-with-arraylike-or-spread-6.js

@@ -3,11 +3,7 @@
 // found in the LICENSE file.
 
 // Flags: --allow-natives-syntax --turbo-optimize-apply --turbofan
-
-// These tests do not work well if this script is run more than once (e.g.
-// --stress-opt); after a few runs the whole function is immediately compiled
-// and assertions would fail. We prevent re-runs.
-// Flags: --nostress-opt --no-always-turbofan
+// Flags: --no-always-turbofan
 
 // These tests do not work well if we flush the feedback vector, which causes
 // deoptimization.

test/mjsunit/compiler/call-with-arraylike-or-spread-7.js

@@ -3,11 +3,7 @@
 // found in the LICENSE file.
 
 // Flags: --allow-natives-syntax --turbo-optimize-apply --turbofan
-
-// These tests do not work well if this script is run more than once (e.g.
-// --stress-opt); after a few runs the whole function is immediately compiled
-// and assertions would fail. We prevent re-runs.
-// Flags: --nostress-opt --no-always-turbofan
+// Flags: --no-always-turbofan
 
 // These tests do not work well if we flush the feedback vector, which causes
 // deoptimization.

test/mjsunit/compiler/call-with-arraylike-or-spread.js

@@ -3,11 +3,7 @@
 // found in the LICENSE file.
 
 // Flags: --allow-natives-syntax --turbo-optimize-apply --turbofan
-
-// These tests do not work well if this script is run more than once (e.g.
-// --stress-opt); after a few runs the whole function is immediately compiled
-// and assertions would fail. We prevent re-runs.
-// Flags: --nostress-opt --no-always-turbofan
+// Flags: --no-always-turbofan
 
 // These tests do not work well if we flush the feedback vector, which causes
 // deoptimization.

test/mjsunit/compiler/regress-9017.js

@@ -4,7 +4,7 @@
 
 // Flags: --allow-natives-syntax --noturbo-inlining --noturbo-verify-allocation
 // This test invokes optimization manually, no need for stress modes:
-// Flags: --nostress-opt --noalways-turbofan
+// Flags: --noalways-turbofan
 // This neuters too low stack size passed by the flag fuzzer.
 // Flags: --stack-size=864
 

test/mjsunit/compiler/verify-type.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt --no-always-turbofan --no-concurrent-recompilation
+// Flags: --allow-natives-syntax --no-always-turbofan --no-concurrent-recompilation
 
 function foo(x) {
   return %VerifyType(x * x);

test/mjsunit/concurrent-initial-prototype-change-1.js

@@ -26,14 +26,7 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --allow-natives-syntax --concurrent-recompilation
-// Flags: --no-stress-opt --no-always-turbofan
-//
-// --nostress-opt is in place because this particular optimization
-// (guaranteeing that the Array prototype chain has no elements) is
-// maintained isolate-wide. Once it's been "broken" by the change
-// to the Object prototype below, future compiles will not use the
-// optimization anymore, and the code will remain optimized despite
-// additional changes to the prototype chain.
+// Flags: --no-always-turbofan
 
 function f1(a, i) {
   return a[i] + 0.5;

test/mjsunit/concurrent-initial-prototype-change-2.js

@@ -26,14 +26,7 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --allow-natives-syntax --concurrent-recompilation
-// Flags: --nostress-opt --no-always-turbofan
-
-// --nostress-opt is in place because this particular optimization
-// (guaranteeing that the Array prototype chain has no elements) is
-// maintained isolate-wide. Once it's been "broken" by the change
-// to the Object prototype below, future compiles will not use the
-// optimization anymore, and the code will remain optimized despite
-// additional changes to the prototype chain.
+// Flags: --no-always-turbofan
 
 function f1(a, i) {
   return a[i] + 0.5;

test/mjsunit/constant-folding-2.js

@@ -26,7 +26,7 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 
-// Flags: --allow-natives-syntax --nostress-opt --turbofan
+// Flags: --allow-natives-syntax --turbofan
 // Flags: --no-stress-flush-code --no-lazy-feedback-allocation
 
 function test(f, iterations) {

test/mjsunit/deopt-with-fp-regs.js

@@ -52,8 +52,6 @@ function test(a, b, c, d, e, v) {
   // this point.
   side_effect++;
   // The following field of the global object will be deleted to force a deopt.
-  // If we use type feedback to deopt, then tests ran with --stress-opt will
-  // not deopt after a few iteration.
   // If we use %DeoptimizeFunction, all values will be on the frame due to the
   // call and we will not exercise the translation mechanism handling fp
   // registers.

test/mjsunit/elements-kind.js

@@ -25,7 +25,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --allow-natives-syntax --expose-gc --nostress-opt
+// Flags: --allow-natives-syntax --expose-gc
 // Flags: --deopt-every-n-times=0
 
 var elements_kind = {

test/mjsunit/elements-transition-hoisting.js

@@ -26,7 +26,7 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --allow-natives-syntax
-// Flags: --nostress-opt --turbofan
+// Flags: --turbofan
 
 // Ensure that ElementsKind transitions in various situations are hoisted (or
 // not hoisted) correctly, don't change the semantics programs and don't trigger

test/mjsunit/elements-transition.js

@@ -26,7 +26,7 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --allow-natives-syntax
-// Flags: --nostress-opt
+// Flags:
 
 // This code exists to eliminate the learning influence of AllocationSites
 // on the following tests.

test/mjsunit/ensure-growing-store-learns.js

@@ -53,8 +53,6 @@
   assertOptimized(foo);
   assertTrue(%HasDictionaryElements(b));
 
-  // Clearing feedback for the StoreIC in foo is important for runs with
-  // flag --stress-opt.
   %ClearFunctionFeedback(foo);
 })();
 

test/mjsunit/es6/block-conflicts-sloppy.js

@@ -4,7 +4,7 @@
 
 // Test for conflicting variable bindings.
 // Stress-testing this test is very slow and provides no useful coverage.
-// Flags: --nostress-opt --noalways-turbofan
+// Flags: --noalways-turbofan
 
 function CheckException(e) {
   var string = e.toString();

test/mjsunit/es6/block-const-assign.js

@@ -30,7 +30,7 @@
 // prefix/postfix decrement/increment operators.
 
 // Optimization stress is not useful for early syntax errors.
-// Flags: --nostress-opt --noalways-turbofan
+// Flags: --noalways-turbofan
 
 "use strict";
 

test/mjsunit/es6/large-classes-properties.js

@@ -4,7 +4,7 @@
 
 // Flags: --allow-natives-syntax
 // This gets very slow with stress flags, and triggers optimization anyway:
-// Flags: --nostress-opt --noalways-turbofan
+// Flags: --noalways-turbofan
 
 (function testLargeClassesProperties(){
   // This is to test for dictionary mode when there more than

test/mjsunit/es6/map-iterator-1.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 var map = new Map([[1,2], [2,3], [3,4]]);
 

test/mjsunit/es6/map-iterator-10.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 // This tests the interaction between the MapIterator protector and SetIterator
 // protector.

test/mjsunit/es6/map-iterator-2.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 var map = new Map([[1,2], [2,3], [3,4]]);
 assertTrue(%MapIteratorProtector());

test/mjsunit/es6/map-iterator-3.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 var map = new Map([[1,2], [2,3], [3,4]]);
 assertTrue(%MapIteratorProtector());

test/mjsunit/es6/map-iterator-4.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 var map = new Map([[1,2], [2,3], [3,4]]);
 assertTrue(%MapIteratorProtector());

test/mjsunit/es6/map-iterator-5.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 var map = new Map([[1,2], [2,3], [3,4]]);
 assertTrue(%MapIteratorProtector());

test/mjsunit/es6/map-iterator-6.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 var map = new Map([[1,2], [2,3], [3,4]]);
 assertTrue(%MapIteratorProtector());

test/mjsunit/es6/map-iterator-7.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 var map = new Map([[1,2], [2,3], [3,4]]);
 assertTrue(%MapIteratorProtector());

test/mjsunit/es6/map-iterator-8.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 // This tests the interaction between the MapIterator protector and SetIterator
 // protector.

test/mjsunit/es6/map-iterator-9.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 // This tests the interaction between the MapIterator protector and SetIterator
 // protector.

test/mjsunit/es6/set-iterator-1.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 var set = new Set([1,2,3]);
 

test/mjsunit/es6/set-iterator-10.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 // This tests the interaction between the MapIterator protector and SetIterator
 // protector.

test/mjsunit/es6/set-iterator-2.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 var set = new Set([1,2,3]);
 

test/mjsunit/es6/set-iterator-3.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 var set = new Set([1,2,3]);
 

test/mjsunit/es6/set-iterator-4.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 var set = new Set([1,2,3]);
 

test/mjsunit/es6/set-iterator-5.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 var set = new Set([1,2,3]);
 

test/mjsunit/es6/set-iterator-6.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 var set = new Set([1,2,3]);
 

test/mjsunit/es6/set-iterator-7.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 var set = new Set([1,2,3]);
 

test/mjsunit/es6/set-iterator-8.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 // This tests the interaction between the MapIterator protector and SetIterator
 // protector.

test/mjsunit/es6/set-iterator-9.js

@@ -3,7 +3,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 // This tests the interaction between the MapIterator protector and SetIterator
 // protector.

test/mjsunit/es6/string-iterator2.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 // Tests for spreading primitive strings.
 

test/mjsunit/es6/string-iterator3.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 // Tests for primitive strings.
 

test/mjsunit/es6/string-iterator4.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 // Tests for wrapped strings.
 

test/mjsunit/es6/string-iterator6.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%StringIteratorProtector());
 

test/mjsunit/es6/super-ic-opt-no-turboprop.js

@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 
 // Flags: --allow-natives-syntax --super-ic --turbofan
-// Flags: --no-always-turbofan --no-stress-opt --deopt-every-n-times=0
+// Flags: --no-always-turbofan --deopt-every-n-times=0
 
 // This file contains tests which are disabled for TurboProp. TurboProp deopts
 // differently than TurboFan, so the assertions about when a function is

test/mjsunit/es6/super-ic-opt.js

@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 
 // Flags: --allow-natives-syntax --super-ic --turbofan
-// Flags: --no-always-turbofan --no-stress-opt --deopt-every-n-times=0
+// Flags: --no-always-turbofan --deopt-every-n-times=0
 
 (function TestPropertyIsInTheHomeObjectsProto() {
   // Test where the property is a constant found on home object's proto. This

test/mjsunit/eval-origin.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --nostress-opt
+// Flags:
 
 Error.prepareStackTrace = function(exception, frames) {
   return frames[0].getEvalOrigin();

test/mjsunit/field-type-tracking.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --nostress-opt --track-field-types
+// Flags: --allow-natives-syntax --track-field-types
 // Flags: --turbofan --no-always-turbofan
 
 (function() {

test/mjsunit/harmony/atomics-waitasync-1thread-buffer-out-of-scope-timeout.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --harmony-sharedarraybuffer --harmony-atomics-waitasync --expose-gc --no-stress-opt
+// Flags: --harmony-sharedarraybuffer --harmony-atomics-waitasync --expose-gc
 
 d8.file.execute("test/mjsunit/harmony/atomics-waitasync-helpers.js");
 

test/mjsunit/harmony/weakrefs/cleanupsome-after-unregister.js

@@ -20,8 +20,6 @@ let key = {"k": "this is the key"};
   // cleanupSome won't do anything since there are no reclaimed targets.
   fg.cleanupSome();
   assertEquals(0, cleanup_count);
-  // Keep o alive to the end of the function, so that --stress-opt mode
-  // is robust towards --gc-interval timing.
   return o;
 })();
 

test/mjsunit/keyed-load-hole-to-undefined.js

@@ -2,9 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt --turbofan --no-always-turbofan
+// Flags: --allow-natives-syntax --turbofan --no-always-turbofan
 
-// --nostress-opt is specified because the test corrupts the "pristine"
+// is specified because the test corrupts the "pristine"
 // array prototype chain by storing an element, and this is tracked
 // per-isolate. A subsequent stress run would send the load generic,
 // and no more deoptimizations of foo would occur.

test/mjsunit/keyed-store-generic.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 function f(a, i, v) { a[i] = v; }
 f("make it generic", 0, 0);

test/mjsunit/maglev/18.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
-// Flags: --allow-natives-syntax --maglev --no-stress-opt
+// Flags: --allow-natives-syntax --maglev
 
 function f(x) {
   var y = 0;

test/mjsunit/maglev/add-number.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt
+// Flags: --allow-natives-syntax --maglev
 
 (function() {
   function add(x, y) {

test/mjsunit/maglev/add-smi.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt
+// Flags: --allow-natives-syntax --maglev
 
 // Checks Smi add operation and deopt while untagging.
 (function() {

test/mjsunit/maglev/call-js-runtime.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt --no-always-turbofan
+// Flags: --allow-natives-syntax --maglev --no-always-turbofan
 
 function Bar(x) {
   this.bar = x

test/mjsunit/maglev/call-runtime-for-pair.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt --no-always-turbofan
+// Flags: --allow-natives-syntax --maglev --no-always-turbofan
 
 function bar(x){
   return x

test/mjsunit/maglev/destructuring-assignment-with-exclude-properties.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt --no-always-turbofan
+// Flags: --allow-natives-syntax --maglev --no-always-turbofan
 
 function foo(x) {
   const { a, b, ...rest } = {a:1, b:1, c:1, d:1};

test/mjsunit/maglev/eager-deopt-in-inline.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --maglev-inlining --no-stress-opt
+// Flags: --allow-natives-syntax --maglev --maglev-inlining
 
 function inner(o) {
   "use strict"

test/mjsunit/maglev/get-template-object.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt --no-always-turbofan
+// Flags: --allow-natives-syntax --maglev --no-always-turbofan
 
 function bar(x, y){
   return [...x, y]

test/mjsunit/maglev/inner-function.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt
+// Flags: --allow-natives-syntax --maglev
 
 function foo(x) {
   var inner = function() {

test/mjsunit/maglev/int32-branch.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt --no-always-turbofan
+// Flags: --allow-natives-syntax --maglev --no-always-turbofan
 
 function foo(x,y) {
   if (x < y) {

test/mjsunit/maglev/lda-global-inside-typeof.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt --no-always-turbofan
+// Flags: --allow-natives-syntax --maglev --no-always-turbofan
 
 var b = 1;
 function foo() {

test/mjsunit/maglev/lda-global.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt --no-always-turbofan
+// Flags: --allow-natives-syntax --maglev --no-always-turbofan
 
 var b = 1;
 function foo(x) {

test/mjsunit/maglev/lda-module-variable-import.mjs

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt --no-always-turbofan
+// Flags: --allow-natives-syntax --maglev --no-always-turbofan
 
 const b = 1;
 export {b};

test/mjsunit/maglev/lda-module-variable.mjs

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt --no-always-turbofan
+// Flags: --allow-natives-syntax --maglev --no-always-turbofan
 
 // Test LdaModuleVariable with imports.
 import {b} from './lda-module-variable-import.mjs'

test/mjsunit/maglev/literals.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt
+// Flags: --allow-natives-syntax --maglev
 
 // Empty array.
 (function() {

test/mjsunit/maglev/load-named.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt
+// Flags: --allow-natives-syntax --maglev
 
 // Checks simple monomorphic load of a Smi field works
 (function() {

test/mjsunit/maglev/lots-of-registers.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt
+// Flags: --allow-natives-syntax --maglev
 
 function foo() {
   var x0 = 0;

test/mjsunit/maglev/mutable-context-access.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt
+// Flags: --allow-natives-syntax --maglev
 
 function factory() {
   var x = 1;

test/mjsunit/maglev/set-pending-message.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt --no-always-turbofan
+// Flags: --allow-natives-syntax --maglev --no-always-turbofan
 
 function foo() {
   try {

test/mjsunit/maglev/shift-right-smi.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt
+// Flags: --allow-natives-syntax --maglev
 
 // Checks Smi shift_right operation and deopt while untagging.
 (function() {

test/mjsunit/maglev/simple-inlining.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --maglev-inlining --no-stress-opt
+// Flags: --allow-natives-syntax --maglev --maglev-inlining
 
 function global_func(x) {
   return x;

test/mjsunit/maglev/spill-double.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt
+// Flags: --allow-natives-syntax --maglev
 
 // This tests that we can lazy deopt with a double spilled.
 

test/mjsunit/maglev/sta-module-variable.mjs

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt --no-always-turbofan
+// Flags: --allow-natives-syntax --maglev --no-always-turbofan
 
 export let x = 1;
 function foo(y) {

test/mjsunit/maglev/string-compare.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt --no-always-turbofan
+// Flags: --allow-natives-syntax --maglev --no-always-turbofan
 // Flags: --no-always-use-string-forwarding-table
 
 let internalized1234 = %ConstructInternalizedString("1234123412341234");

test/mjsunit/maglev/super-ic.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt
+// Flags: --allow-natives-syntax --maglev
 
 class A {
     foo() {

test/mjsunit/maglev/tier-to-ml-to-tf.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
-// Flags: --allow-natives-syntax --maglev --no-stress-opt
+// Flags: --allow-natives-syntax --maglev
 // Flags: --no-baseline-batch-compilation
 
 function f(x) {

test/mjsunit/maglev/undefined-or-null-branch.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --maglev --no-stress-opt --no-always-turbofan
+// Flags: --allow-natives-syntax --maglev --no-always-turbofan
 
 function foo(x) {
   return x ?? 10

test/mjsunit/promise-hooks.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --turbofan --no-always-turbofan --no-stress-opt --deopt-every-n-times=0 --ignore-unhandled-promises
+// Flags: --allow-natives-syntax --turbofan --no-always-turbofan --deopt-every-n-times=0 --ignore-unhandled-promises
 
 let log = [];
 let asyncId = 0;

test/mjsunit/protector-cell/array-constructor-2.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/array-constructor.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/array-iterator-2.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%SetIteratorProtector());
 assertTrue(%MapIteratorProtector());

test/mjsunit/protector-cell/array-iterator.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%SetIteratorProtector());
 assertTrue(%MapIteratorProtector());

test/mjsunit/protector-cell/array-next-1.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%SetIteratorProtector());
 assertTrue(%MapIteratorProtector());

test/mjsunit/protector-cell/array-next-2.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%SetIteratorProtector());
 assertTrue(%MapIteratorProtector());

test/mjsunit/protector-cell/bigint64Array-species.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%TypedArraySpeciesProtector());
 class MyBigInt64Array extends BigInt64Array { }

test/mjsunit/protector-cell/biguint64Array-species.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%TypedArraySpeciesProtector());
 class MyBigUint64Array extends BigUint64Array { }

test/mjsunit/protector-cell/concat-spreadable.js.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%IsConcatSpreadableProtector());
 Object.defineProperty(Array, Symbol.isConcatSpreadable, { value: false });

test/mjsunit/protector-cell/float32Array-species.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%TypedArraySpeciesProtector());
 class MyFloat32Array extends Float32Array { }

test/mjsunit/protector-cell/float64Array-species.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%TypedArraySpeciesProtector());
 class MyFloat64Array extends Float64Array { }

test/mjsunit/protector-cell/int16Array-species.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%TypedArraySpeciesProtector());
 class MyInt16Array extends Int16Array { }

test/mjsunit/protector-cell/int32Array-species.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%TypedArraySpeciesProtector());
 class MyInt32Array extends Int32Array { }

test/mjsunit/protector-cell/int8array-species.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%TypedArraySpeciesProtector());
 class MyInt8Array extends Int8Array { }

test/mjsunit/protector-cell/iterator.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%SetIteratorProtector());
 assertTrue(%MapIteratorProtector());

test/mjsunit/protector-cell/map-iterator-2.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%SetIteratorProtector());
 assertTrue(%MapIteratorProtector());

test/mjsunit/protector-cell/map-iterator.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%SetIteratorProtector());
 assertTrue(%MapIteratorProtector());

test/mjsunit/protector-cell/map-next-1.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%SetIteratorProtector());
 assertTrue(%MapIteratorProtector());

test/mjsunit/protector-cell/map-next-2.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%SetIteratorProtector());
 assertTrue(%MapIteratorProtector());

test/mjsunit/protector-cell/promise-constructor-2.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/promise-constructor.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/regexp-constructor-2.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/regexp-constructor.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/set-iterator-1.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%SetIteratorProtector());
 assertTrue(%MapIteratorProtector());

test/mjsunit/protector-cell/set-iterator-2.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%SetIteratorProtector());
 assertTrue(%MapIteratorProtector());

test/mjsunit/protector-cell/set-iterator-3.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%SetIteratorProtector());
 assertTrue(%MapIteratorProtector());

test/mjsunit/protector-cell/set-iterator-4.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%SetIteratorProtector());
 assertTrue(%MapIteratorProtector());

test/mjsunit/protector-cell/set-next-1.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%SetIteratorProtector());
 assertTrue(%MapIteratorProtector());

test/mjsunit/protector-cell/set-next-2.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%SetIteratorProtector());
 assertTrue(%MapIteratorProtector());

test/mjsunit/protector-cell/species.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 class MyArray extends Array { }

test/mjsunit/protector-cell/string-iterator.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%StringIteratorProtector());
 Object.defineProperty(String.prototype, Symbol.iterator, { value: {} });

test/mjsunit/protector-cell/string-next-1.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%SetIteratorProtector());
 assertTrue(%MapIteratorProtector());

test/mjsunit/protector-cell/string-next-2.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%SetIteratorProtector());
 assertTrue(%MapIteratorProtector());

test/mjsunit/protector-cell/typedarray-constructor-1.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/typedarray-constructor-10.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/typedarray-constructor-2.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/typedarray-constructor-3.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/typedarray-constructor-4.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/typedarray-constructor-5.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/typedarray-constructor-6.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/typedarray-constructor-7.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/typedarray-constructor-8.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/typedarray-constructor-9.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/typedarray-prototype-constructor-1.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/typedarray-prototype-constructor-10.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/typedarray-prototype-constructor-2.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/typedarray-prototype-constructor-3.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/typedarray-prototype-constructor-4.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/typedarray-prototype-constructor-5.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/typedarray-prototype-constructor-6.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/typedarray-prototype-constructor-7.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/typedarray-prototype-constructor-8.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/typedarray-prototype-constructor-9.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%ArraySpeciesProtector());
 assertTrue(%PromiseSpeciesProtector());

test/mjsunit/protector-cell/uint16Array-species.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%TypedArraySpeciesProtector());
 class MyUint16Array extends Uint16Array { }

test/mjsunit/protector-cell/uint32Array-species.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%TypedArraySpeciesProtector());
 class MyUint32Array extends Uint32Array { }

test/mjsunit/protector-cell/uint8Array-species.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --no-stress-opt
+// Flags: --allow-natives-syntax
 
 assertTrue(%TypedArraySpeciesProtector());
 class MyUint8Array extends Uint8Array { }

test/mjsunit/random-bit-correlations.js

@@ -6,7 +6,7 @@
 // flaky. Due to flag contradiction checking, this requires
 // --allow-overwriting-for-next-flag to avoid an error.
 // Flags: --allow-overwriting-for-next-flag --random-seed=20
-// Flags: --nostress-opt --noalways-turbofan --predictable
+// Flags: --noalways-turbofan --predictable
 
 (function() {
   var kHistory = 2;

test/mjsunit/readonly.js

@@ -27,7 +27,7 @@
 
 // Flags: --allow-natives-syntax
 // This test manually triggers optimization, no need for stress modes.
-// Flags: --nostress-opt --noalways-turbofan
+// Flags: --noalways-turbofan
 
 // Different ways to create an object.
 

test/mjsunit/regress/regress-319722-ArrayBuffer.js

@@ -25,7 +25,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --nostress-opt --allow-natives-syntax --mock-arraybuffer-allocator
+// Flags: --allow-natives-syntax --mock-arraybuffer-allocator
 
 let kArrayBufferByteLengthLimit = %ArrayBufferMaxByteLength() + 1;
 let kTypedArrayLengthLimit = %TypedArrayMaxLength() + 1;

test/mjsunit/regress/regress-319722-TypedArrays.js

@@ -25,7 +25,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --nostress-opt --allow-natives-syntax --mock-arraybuffer-allocator
+// Flags: --allow-natives-syntax --mock-arraybuffer-allocator
 
 let kArrayBufferByteLengthLimit = %ArrayBufferMaxByteLength() + 1;
 let kTypedArrayLengthLimit = %TypedArrayMaxLength() + 1;

test/mjsunit/regress/regress-379770.js

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-// Flags: --allow-natives-syntax --nostress-opt
+// Flags: --allow-natives-syntax
 // Flags: --nouse-osr
 
 function foo(obj) {

test/mjsunit/regress/regress-4578.js

@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 
 // Flags: --allow-natives-syntax --expose-gc --turbofan --no-concurrent-recompilation
-// Flags: --no-stress-opt --no-always-turbofan --no-assert-types
+// Flags: --no-always-turbofan --no-assert-types
 
 // This weak ref is for checking whether the closure-allocated object o got
 // collected as it should.

test/mjsunit/regress/regress-655573.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --no-always-turbofan --no-stress-opt
+// Flags: --no-always-turbofan
 
 // Generate a function with a very large closure.
 source = "(function() {\n"

test/mjsunit/regress/regress-crbug-352058.js

-// Copyright 2014 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Flags: --allow-natives-syntax --check-elimination --stress-opt
-
-var v0 = this;
-var v2 = this;
-function f() {
-  v2 = [1.2, 2.3];
-  v0 = [12, 23];
-};
-%PrepareFunctionForOptimization(f);
-f();
-f();
-%OptimizeFunctionOnNextCall(f);
-f();

test/mjsunit/regress/regress-crbug-736451.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --expose-externalize-string --no-stress-opt
+// Flags: --expose-externalize-string
 
 !function() {
   const s0 = "external string turned into two byte";

test/mjsunit/regress/regress-crbug-808192.js

@@ -4,7 +4,7 @@
 
 // Flags: --expose-gc
 // Stress-testing this test is very slow and doesn't provide useful coverage.
-// Flags: --nostress-opt --noalways-turbofan
+// Flags: --noalways-turbofan
 
 const f = eval(`(function f(i) {
   if (i == 0) {

test/mjsunit/regress/regress-crbug-941743.js

@@ -4,7 +4,7 @@
 
 // Flags: --allow-natives-syntax --noenable-slow-asserts
 // This test triggers optimization manually, no stress mode necessary.
-// Flags: --nostress-opt --noalways-turbofan
+// Flags: --noalways-turbofan
 
 // This call ensures that TurboFan won't inline array constructors.
 Array(2 ** 30);

test/mjsunit/regress/regress-fast-literal-transition.js

@@ -32,9 +32,7 @@
 // boilerplate. The --always-turbofan flag makes sure that optimized code is
 // not thrown away at deoptimization.
 
-// The switch statement in f() makes sure that f() is not inlined. If we
-// start inlining switch statements, we will still catch the bug on the
-// final --stress-opt run.
+// The switch statement in f() makes sure that f() is not inlined.
 
 function f(x) {
   switch (x) {

test/mjsunit/regress/regress-v8-12194.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --turbofan --no-always-turbofan --no-stress-opt
+// Flags: --allow-natives-syntax --turbofan --no-always-turbofan
 // Flags: --deopt-every-n-times=0 --no-force-slow-path
 
 (function TestSliceWithoutParams() {

test/mjsunit/regress/wasm/regress-647649.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --nostress-opt --expose-gc --noalways-turbofan --invoke-weak-callbacks
+// Flags: --expose-gc --noalways-turbofan --invoke-weak-callbacks
 
 // This test was generated by the fuzzer.
 

test/mjsunit/regress/wasm/regress-731351.js

-// Copyright 2017 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Flags: --validate-asm --expose-gc --stress-opt
-
-gc();
-function asm(stdlib, foreign, buffer) {
-  "use asm";
-  var HEAP32 = new stdlib.Uint32Array(buffer);
-  function load(a) {
-    a = a | 0;
-    return +(HEAP32[a >> 2] >>> 0);
-  }
-  return {load: load};
-}
-
-function RunAsmJsTest() {
-  buffer = new ArrayBuffer(65536);
-  var asm_module = asm({Uint32Array: Uint32Array}, {}, buffer);
-  asm_module.load(buffer.byteLength);
-}
-RunAsmJsTest();

test/mjsunit/tools/log.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --logfile='+' --log --log-code --no-stress-opt
+// Flags: --logfile='+' --log --log-code
 
 function testFunctionWithFunnyName(o) {
   return o.a;

test/mjsunit/tools/log_two_byte.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --logfile='+' --log --log-code --log-function-events --no-stress-opt
+// Flags: --logfile='+' --log --log-code --log-function-events
 // Flags: --no-stress-background-compile
 
 let twoByteName = "twoByteName_🍕"

test/mjsunit/tools/processor.mjs

@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 
 // Flags: --logfile='+' --log --log-maps --log-ic --log-code
-// Flags: --log-function-events --no-stress-opt --no-predictable
+// Flags: --log-function-events --no-predictable
 
 import { Processor } from "../../../tools/system-analyzer/processor.mjs";
 

test/mjsunit/unary-minus-deopt.js

@@ -46,7 +46,8 @@ assertOptimized(unaryMinusTest);
 
 // Deopt on kMinInt
 unaryMinusTest(31);
-// The following is normally true, but not with --stress-opt. :-/
+// TODO(v8:13245): Investigate why this assertion fails and what intended
+// behavior is.
 // assertUnoptimized(unaryMinusTest);
 %PrepareFunctionForOptimization(unaryMinusTest);
 

test/mjsunit/wasm/many-memories-no-trap-handler.js

@@ -4,9 +4,6 @@
 
 // Flags: --no-wasm-trap-handler
 
-// No reason to stress-opt this; save some time.
-// Flags: --no-stress-opt
-
 d8.file.execute('test/mjsunit/wasm/wasm-module-builder.js');
 
 // Without trap handlers, we are able to allocate basically arbitrarily many

test/mjsunit/wasm/many-memories.js

@@ -2,9 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// No reason to stress-opt this; save some time.
-// Flags: --no-stress-opt
-
 d8.file.execute('test/mjsunit/wasm/wasm-module-builder.js');
 
 // Test that we can generate at least 50 memories of small size.

test/mjsunit/wasm/many-modules.js

@@ -2,9 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// No reason to stress-opt this; save some time.
-// Flags: --no-stress-opt
-
 d8.file.execute('test/mjsunit/wasm/wasm-module-builder.js');
 
 // We generate the module bytes once to make this test more efficient,

test/mjsunit/wasm/wasm-dynamic-tiering.js

@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 
 // Flags: --allow-natives-syntax --wasm-dynamic-tiering --liftoff
-// Flags: --no-wasm-tier-up --no-stress-opt
+// Flags: --no-wasm-tier-up
 // Make the test faster:
 // Flags: --wasm-tiering-budget=1000
 

test/unittests/logging/log-unittest.cc

@@ -1131,7 +1131,7 @@ class LogFunctionEventsTest : public LogTest {
 };
 
 TEST_F(LogFunctionEventsTest, LogFunctionEvents) {
-  // Always opt and stress opt will break the fine-grained log order.
+  // --always-turbofan will break the fine-grained log order.
   if (i::FLAG_always_turbofan) return;
 
   {

tools/clusterfuzz/js_fuzzer/exceptions.js

@@ -140,7 +140,6 @@ const DISALLOWED_DIFFERENTIAL_FUZZ_FLAGS = [
     /^--trace.*/,
     '--expose-externalize-string',
     '--interpreted-frames-native-stack',
-    '--stress-opt',
     '--validate-asm',
 ];