Adapt Danno's Track Allocation Info idea to fast literals. When allocating a literal array,

src/code-stubs.h

 // 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 368 matching lines @@
 
 class FastCloneShallowArrayStub : public CodeStub {
  public:
   // Maximum length of copied elements array.
   static const int kMaximumClonedLength = 8;
 
   enum Mode {
     CLONE_ELEMENTS,
     CLONE_DOUBLE_ELEMENTS,
     COPY_ON_WRITE_ELEMENTS,
-    CLONE_ANY_ELEMENTS
+    CLONE_ANY_ELEMENTS,
+    CLONE_ANY_ELEMENTS_WITH_ALLOCATION_INFO

[danno, 2012/12/26 10:32:01]

Add LAST_CLONE_MODE = CLONE_ANY_ELEMENTS_WITH_ALLOCATION_INFO

[mvstanton, 2013/01/03 14:40:43]

Done.

   };
 
   FastCloneShallowArrayStub(Mode mode, int length)
       : mode_(mode),
         length_((mode == COPY_ON_WRITE_ELEMENTS) ? 0 : length) {
     ASSERT_GE(length_, 0);
     ASSERT_LE(length_, kMaximumClonedLength);
   }
 
   void Generate(MacroAssembler* masm);
 
  private:
   Mode mode_;
   int length_;
 
   Major MajorKey() { return FastCloneShallowArray; }
   int MinorKey() {
-    ASSERT(mode_ == 0 || mode_ == 1 || mode_ == 2 || mode_ == 3);
-    return length_ * 4 +  mode_;
+    ASSERT(mode_ == 0 || mode_ == 1 || mode_ == 2 || mode_ == 3 ||

[danno, 2012/12/26 10:32:01]

While you're here, how about adding a constant
const int kFastCloneModeCount = LAST_CLONE_MODE + 1, then you can ASSERT(mode_
>= 0 && mode_ <= LAST_CLONE_MODE);

[mvstanton, 2013/01/03 14:40:43]

Done.

+           mode_ == 4);
+    return length_ * 5 +  mode_;

[danno, 2012/12/26 10:32:01]

return length_ * kFastCloneModeCount + mode_;

[mvstanton, 2013/01/03 14:40:43]

Done.

   }
 };
 
 
 class FastCloneShallowObjectStub : public CodeStub {
  public:
   // Maximum number of properties in copied object.
   static const int kMaximumClonedProperties = 6;
 
   explicit FastCloneShallowObjectStub(int length) : length_(length) {
@@ skipping 809 matching lines @@
 
   // The current function entry hook.
   static FunctionEntryHook entry_hook_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileEntryHookStub);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_