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

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index ae113f5729a58d26bcdfeffff0ee5011a2570954..a3bba6eae658e5a775abcfc4c9dfc2c7d739767d 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -386,7 +386,8 @@ class FastCloneShallowArrayStub : public CodeStub {
     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)
@@ -404,8 +405,9 @@ class FastCloneShallowArrayStub : public CodeStub {
 
   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.

   }
 };