[wasm] Add stress test of atomic opcodes.

This test runs random sequences of atomic wasm operations on multiple
threads and tries to compute an equivalent sequential interleaving that
would reproduce intermediate results.
By its nature, this test might time out and is flaky.

Bug: v8:6532
Change-Id: Iafdab4561cbf37a5c3fa9b8af9d0fbaaf5681608
Reviewed-on: https://chromium-review.googlesource.com/c/1195366
Commit-Queue: Stephan Herhut <herhut@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56810}

test/mjsunit/mjsunit.status

@@ -32,6 +32,8 @@
   'modules-skip*': [SKIP],
   'harmony/modules-skip*': [SKIP],
   'regress/modules-skip*': [SKIP],
+  'wasm/wasm-constants': [SKIP],
+  'wasm/wasm-module-builder': [SKIP],
 
   # All tests in the bug directory are expected to fail.
   'bugs/*': [FAIL],
@@ -175,6 +177,7 @@
   'wasm/embenchen/*': [PASS, SLOW],
   'wasm/grow-memory': [PASS, SLOW],
   'wasm/unreachable-validation': [PASS, SLOW],
+  'wasm/atomics-stress': [PASS, SLOW, ['(arch == arm or arch == arm64) and simulator_run', SKIP]],
 
   # case-insensitive unicode regexp relies on case mapping provided by ICU.
   'es6/unicode-regexp-ignore-case': [PASS, ['no_i18n == True', FAIL]],
@@ -806,8 +809,9 @@
   # Too memory hungry on Odroid devices.
   'regress/regress-678917': [PASS, ['arch == arm and not simulator_run', SKIP]],
 
-  # https://crbug.com/v8/8164
+  # These tests already stress d8 by using many workers. No need for extra stress.
   'wasm/compare-exchange-stress': [SKIP],
+  'wasm/atomics-stress': [SKIP],
 
   # Too slow for verify-csa builds.
   'big-object-literal': [PASS, ['verify_csa == True', SKIP]],