[Liftoff] Stage Liftoff and tier up behind --future

In order to get more test coverage (also on ClusterFuzz), stage Liftoff
and tier up behind --future.

R=hablich@chromium.org
CC=​​titzer@chromium.org

Bug: v8:6600
Change-Id: I718e17957b26f60aa4c002333035f693344806e0
Reviewed-on: https://chromium-review.googlesource.com/1042385Reviewed-by: Ben Titzer <titzer@chromium.org>
Reviewed-by: Michael Hablich <hablich@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52987}

src/flag-definitions.h

@@ -535,6 +535,7 @@ DEFINE_UINT(wasm_max_table_size, v8::internal::wasm::kV8MaxWasmTableSize,
             "maximum table size of a wasm instance")
 DEFINE_BOOL(wasm_tier_up, false,
             "enable basic tiering up to the optimizing compiler")
+DEFINE_IMPLICATION(future, wasm_tier_up)
 DEFINE_IMPLICATION(wasm_tier_up, liftoff)
 DEFINE_DEBUG_BOOL(trace_wasm_decoder, false, "trace decoding of wasm code")
 DEFINE_DEBUG_BOOL(trace_wasm_decode_time, false,

test/message/wasm-trace-memory-liftoff.js

@@ -2,6 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --no-stress-opt --expose-wasm --wasm-trace-memory --liftoff
+// Flags: --no-stress-opt --wasm-trace-memory --liftoff --no-future
 
 load("test/message/wasm-trace-memory.js");

test/message/wasm-trace-memory.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 --expose-wasm --wasm-trace-memory --no-liftoff
+// Flags: --no-stress-opt --wasm-trace-memory --no-liftoff --no-future
 
 load("test/mjsunit/wasm/wasm-constants.js");
 load("test/mjsunit/wasm/wasm-module-builder.js");

test/mjsunit/mjsunit.status

@@ -823,9 +823,9 @@
 }], # arch != x64 and arch != ia32
 
 ##############################################################################
-['variant == liftoff', {
-  # In the liftoff variant, liftoff compilation happens even though the test
-  # does not explicitly enable it.
+['variant == liftoff or variant == future', {
+  # In the liftoff and future variant, liftoff compilation happens even
+  # though the test does not explicitly enable it.
   'wasm/default-liftoff-setting': [SKIP],
 }], # variant == liftoff
 

test/mjsunit/wasm/liftoff.js

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 // Flags: --allow-natives-syntax --liftoff --wasm-async-compilation
+// Flags: --no-future
 
 load('test/mjsunit/wasm/wasm-constants.js');
 load('test/mjsunit/wasm/wasm-module-builder.js');