[wasm] Enable WASM by default (--expose-wasm=true).

test/mjsunit/mjsunit.status

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 222 matching lines @@
   'array-constructor': [PASS, SLOW],
   'json': [PASS, SLOW],
   'regress/regress-446389': [PASS, SLOW],
   'regress/regress-inline-getter-near-stack-limit': [PASS, SLOW],
 
   # BUG(v8:4779): Crashes flakily with stress mode on arm64.
   'array-splice': [PASS, SLOW, ['arch == arm64', FAST_VARIANTS]],
 
   #BUG(v8:5683)
   'wasm/import-memory': [SKIP],
+
+  # Crashes with WASM turned on by default on arm64 gc-stress
+  'regress/regress-500831': [PASS, ['arch == arm64', SKIP]],
 }],  # 'gc_stress == True'
 
 ##############################################################################
 ['byteorder == big', {
   # Emscripten requires little-endian, skip all tests on big endian platforms.
   'asm/embenchen/*': [SKIP],
   'asm/poppler/*': [SKIP],
   'asm/sqlite3/*': [SKIP],
   # TODO(mips-team): Fix Wasm for big-endian.
   'wasm/*': [SKIP],
@@ skipping 384 matching lines @@
   'lithium/*': [SKIP],
   'third_party/*': [SKIP],
   'tools/*': [SKIP],
   'apply': [SKIP],
   'math-*': [SKIP],
   'unicode-test': [SKIP],
   'whitespaces': [SKIP],
 }],  # variant == wasm_traps
 
 ]