Test fix: missing check for JSArray.

BUG=

Review URL: https://codereview.chromium.org/11801036

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13331 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/objects.cc

@@ -9861,7 +9861,7 @@ MaybeObject* JSObject::SetFastElement(uint32_t index,
         : FAST_DOUBLE_ELEMENTS;
 
     MaybeObject* trans = PossiblyTransitionArrayBoilerplate(to_kind);
-    if (trans != NULL && trans->IsFailure()) return trans;
+    if (trans->IsFailure()) return trans;
 
     MaybeObject* maybe =
         SetFastDoubleElementsCapacityAndLength(new_capacity, array_length);
@@ -10406,8 +10406,8 @@ Handle<Object> JSObject::TransitionElementsKind(Handle<JSObject> object,
 
 MaybeObject* JSObject::PossiblyTransitionArrayBoilerplate(
     ElementsKind to_kind) {
-  ASSERT(IsJSArray());
   MaybeObject* ret = NULL;
+  if (IsJSArray()) {
     AllocationSiteInfo* info = AllocationSiteInfo::FindForJSObject(this);
     if (info != NULL) {
       JSObject* payload = JSObject::cast(info->payload());
@@ -10418,6 +10418,7 @@ MaybeObject* JSObject::PossiblyTransitionArrayBoilerplate(
         }
       }
     }
+  }
   return ret;
 }
 
@@ -10433,7 +10434,7 @@ MaybeObject* JSObject::TransitionElementsKind(ElementsKind to_kind) {
   if (from_kind == to_kind) return this;
 
   MaybeObject* trans = PossiblyTransitionArrayBoilerplate(to_kind);
-  if (trans != NULL && trans->IsFailure()) return trans;
+  if (trans->IsFailure()) return trans;
 
   Isolate* isolate = GetIsolate();
   if (elements() == isolate->heap()->empty_fixed_array() ||