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

test/webkit/webkit.status

Index: test/webkit/webkit.status
diff --git a/test/webkit/webkit.status b/test/webkit/webkit.status
index 27a46e70d423a450edf383bef6d040d97871dbec..94a8bbad18799a9780b4473da17a72d7ec715d60 100644
--- a/test/webkit/webkit.status
+++ b/test/webkit/webkit.status
@@ -112,12 +112,6 @@
 }],  # 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],