ClearTypeFeedbackInfo() assumed we have a context in the isolate.

src/objects.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "v8.h"
 
 #include "accessors.h"
 #include "allocation-site-scopes.h"
 #include "api.h"
 #include "arguments.h"
@@ skipping 11227 matching lines @@
                   info->host()->constant_pool());
       }
     }
   }
 }
 
 
 void SharedFunctionInfo::ClearTypeFeedbackInfo() {
   FixedArray* vector = feedback_vector();
   Heap* heap = GetHeap();
-  JSFunction* array_function = NULL;
-
-  // Clearing type feedback can be called when the contexts are still being
-  // set up so caution is required.
-  Context* context = GetIsolate()->context();
-  if (context != NULL) {
-    Context* native_context = context->native_context();
-    Object* candidate = native_context->get(Context::ARRAY_FUNCTION_INDEX);
-    if (candidate->IsJSFunction()) {
-      array_function = JSFunction::cast(candidate);
-    }
-  }
-
   int length = vector->length();
 
   for (int i = 0; i < length; i++) {
     Object* obj = vector->get(i);
     if (obj->IsHeapObject()) {
       InstanceType instance_type =
           HeapObject::cast(obj)->map()->instance_type();
       switch (instance_type) {
         case ALLOCATION_SITE_TYPE:
           // AllocationSites are not cleared because they do not store
           // information that leaks.
           break;
         case JS_FUNCTION_TYPE:
           // No need to clear the native context array function.
-          if (obj == array_function) break;
+          if (obj == JSFunction::cast(obj)->context()->native_context()->
+              get(Context::ARRAY_FUNCTION_INDEX)) {
+            break;
+          }
           // Fall through...
+
         default:
           vector->set(i, TypeFeedbackInfo::RawUninitializedSentinel(heap),
                       SKIP_WRITE_BARRIER);
       }
     }
   }
 }
 
 
 BailoutId Code::TranslatePcOffsetToAstId(uint32_t pc_offset) {
@@ skipping 6032 matching lines @@
 #define ERROR_MESSAGES_TEXTS(C, T) T,
   static const char* error_messages_[] = {
       ERROR_MESSAGES_LIST(ERROR_MESSAGES_TEXTS)
   };
 #undef ERROR_MESSAGES_TEXTS
   return error_messages_[reason];
 }
 
 
 } }  // namespace v8::internal