CallICStub with a "never patch" approach until customization.

src/compiler.cc

 // 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 242 matching lines @@
 }
 
 
 void CompilationInfo::PrepareForCompilation(Scope* scope) {
   ASSERT(scope_ == NULL);
   scope_ = scope;
 
   int length = function()->slot_count();
   if (feedback_vector_.is_null()) {
     // Allocate the feedback vector too.
-    feedback_vector_ = isolate()->factory()->NewFixedArray(length, TENURED);
-    // Ensure we can skip the write barrier
-    ASSERT_EQ(isolate()->heap()->uninitialized_symbol(),
-              *TypeFeedbackInfo::UninitializedSentinel(isolate()));
-    for (int i = 0; i < length; i++) {
-      feedback_vector_->set(
-          i,
-          *TypeFeedbackInfo::UninitializedSentinel(isolate()),
-          SKIP_WRITE_BARRIER);
-    }
+    feedback_vector_ = isolate()->factory()->NewTypeFeedbackVector(length);
   }
   ASSERT(feedback_vector_->length() == length);
 }
 
 
 class HOptimizedGraphBuilderWithPositions: public HOptimizedGraphBuilder {
  public:
   explicit HOptimizedGraphBuilderWithPositions(CompilationInfo* info)
       : HOptimizedGraphBuilder(info) {
   }
@@ skipping 1047 matching lines @@
   AllowHandleDereference allow_deref;
   bool tracing_on = info()->IsStub()
       ? FLAG_trace_hydrogen_stubs
       : (FLAG_trace_hydrogen &&
          info()->closure()->PassesFilter(FLAG_trace_hydrogen_filter));
   return (tracing_on &&
       OS::StrChr(const_cast<char*>(FLAG_trace_phase), name_[0]) != NULL);
 }
 
 } }  // namespace v8::internal