Revert of Ignore test failure for mjsunit/for-in-opt in gc stress.

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 326 matching lines @@
 
   # Issue 3723.
   'regress/regress-3717': [SKIP],
 
   # BUG(v8:4237)
   'regress/regress-3976': [SKIP],
 
   # BUG(v8:4359)
   'strong/load-proxy': [SKIP],
 
-  # BUG(v8:4381)
-  'for-in-opt': [PASS, FAIL],
-
   # Slow tests.
   'array-constructor': [PASS, SLOW],
   'json': [PASS, SLOW],
   'regress/regress-446389': [PASS, SLOW],
   'regress/regress-inline-getter-near-stack-limit': [PASS, SLOW],
 
   # BUG(v8:4493).
   'tools/profviz': [PASS, NO_VARIANTS],
 }],  # 'gc_stress == True'
 
@@ skipping 371 matching lines @@
   'd8-worker-sharedarraybuffer': [SKIP],
 }],  # 'predictable == True'
 
 ##############################################################################
 ['arch == ppc and simulator_run == True or arch == ppc64 and simulator_run == True', {
 
   # take too long with the simulator.
   'regress/regress-1132': [SKIP],
 }],  # 'arch == ppc and simulator_run == True'
 ]