[turbofan] Properly guard keyed stores wrt. setters in the prototype chain.

test/webkit/webkit.status

 # Copyright 2013 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
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@@ skipping 94 matching lines @@
 }],  # 'gc_stress == True and mode == debug'
 
 ##############################################################################
 ['variant == ignition and msan', {
   # TODO(mythria,4680): Too slow and timeout on ignition.
   'dfg-double-vote-fuzz': [SKIP],
   'dfg-int-overflow-in-loop': [SKIP],
 }],  # variant == ignition and msan
 
 ##############################################################################
-['variant == turbofan', {
-  # BUG(v8:5276): Flaky with turbofan.
-  'fast/js/array-bad-time': [SKIP],
-}],  # variant == turbofan
-
-##############################################################################
 ['variant == ignition_turbofan and msan', {
   # TODO(mythria,4680): Too slow and timeout on ignition.
   'dfg-double-vote-fuzz': [SKIP],
   'dfg-int-overflow-in-loop': [SKIP],
 }],  # variant == ignition_turbofan and msan
 
 ##############################################################################
 ['gcov_coverage', {
   # Tests taking too long or getting too large call stacks.
   'fast/js/excessive-comma-usage': [SKIP],
   'run-json-stringify': [SKIP],
 }],  # 'gcov_coverage'
 
 ##############################################################################
 ]