[test] Add stress_incremental_marking testing variant

Bug: 
Change-Id: Iddb8dde328af42b99c74195a13975346437c7259
Reviewed-on: https://chromium-review.googlesource.com/700635Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48310}

test/cctest/cctest.status

@@ -348,6 +348,11 @@
 
 }],  # 'arch == ppc or arch == ppc64 or arch == s390 or arch == s390x'
 
+##############################################################################
+['variant == stress_incremental_marking', {
+  'test-heap-profiler/SamplingHeapProfiler': [SKIP],
+}],  # variant == stress_incremental_marking
+
 ##############################################################################
 ['variant == wasm_traps', {
   'test-accessors/*': [SKIP],

test/cctest/heap/test-invalidated-slots.cc

@@ -135,6 +135,7 @@ HEAP_TEST(InvalidatedSlotsAfterTrimming) {
 }
 
 HEAP_TEST(InvalidatedSlotsEvacuationCandidate) {
+  ManualGCScope manual_gc_scope;
   CcTest::InitializeVM();
   Heap* heap = CcTest::heap();
   std::vector<ByteArray*> byte_arrays;

test/cctest/test-identity-map.cc

@@ -773,6 +773,7 @@ TEST(CanonicalHandleScope) {
 }
 
 TEST(GCShortCutting) {
+  ManualGCScope manual_gc_scope;
   IdentityMapTester t;
   Isolate* isolate = CcTest::i_isolate();
   Factory* factory = isolate->factory();

test/mjsunit/code-coverage-precise.js

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 // Flags: --allow-natives-syntax --no-always-opt
+// Flags: --no-stress-incremental-marking
 // Files: test/mjsunit/code-coverage-utils.js
 
 // Test precise code coverage.

tools/run-tests.py

@@ -113,6 +113,7 @@ VARIANTS = ["default"]
 
 MORE_VARIANTS = [
   "stress",
+  "stress_incremental_marking",
   "nooptimization",
   "stress_asm_wasm",
   "wasm_traps",

tools/testrunner/local/variants.py

@@ -6,6 +6,7 @@
 ALL_VARIANT_FLAGS = {
   "default": [[]],
   "stress": [["--stress-opt", "--always-opt"]],
+  "stress_incremental_marking":  [["--stress-incremental-marking"]],
   # No optimization means disable all optimizations. OptimizeFunctionOnNextCall
   # would not force optimization too. It turns into a Nop. Please see
   # https://chromium-review.googlesource.com/c/452620/ for more discussion.
@@ -18,6 +19,7 @@ ALL_VARIANT_FLAGS = {
 FAST_VARIANT_FLAGS = {
   "default": [[]],
   "stress": [["--stress-opt"]],
+  "stress_incremental_marking":  [["--stress-incremental-marking"]],
   # No optimization means disable all optimizations. OptimizeFunctionOnNextCall
   # would not force optimization too. It turns into a Nop. Please see
   # https://chromium-review.googlesource.com/c/452620/ for more discussion.
@@ -26,5 +28,5 @@ FAST_VARIANT_FLAGS = {
   "wasm_traps": [["--wasm_guard_pages", "--wasm_trap_handler", "--invoke-weak-callbacks"]],
 }
 
-ALL_VARIANTS = set(["default", "stress", "nooptimization", "stress_asm_wasm",
-                    "wasm_traps"])
+ALL_VARIANTS = set(["default", "stress", "stress_incremental_marking",
+                    "nooptimization", "stress_asm_wasm", "wasm_traps"])