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 527abde958843aa2bbaa255949b43c0a4316efb8..959754d30da61a6c2b29edf39da97fb87d455626 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -422,14 +422,23 @@ class FastCloneShallowArrayStub : public PlatformCodeStub {
  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, 2013/01/04 08:50:55]

CLONE_ANY_ELEMENTS_WITH_ALLOCATION_SITE_INFO?

[mvstanton, 2013/01/04 12:07:52]

Done.

+    LAST_CLONE_MODE = CLONE_ANY_ELEMENTS_WITH_ALLOCATION_INFO
   };
 
+  static const int kFastCloneModeCount = LAST_CLONE_MODE + 1;
+
+  // The stub generator likes to treat the allocation info mode separately.
+  enum AllocationInfoMode {

[danno, 2013/01/04 08:50:55]

AllocationSiteInfoMode?

[mvstanton, 2013/01/04 12:07:52]

Done.

+    DONT_TRACK_ALLOCATION_INFO,
+    TRACK_ALLOCATION_INFO
+  };

[danno, 2013/01/04 08:50:55]

Soon this will be used for other things, so I think it makes sense to move this
out of the FastCloneShallowArrayStub class. Maybe it belongs in objects.h before
the AllocationSiteInfo class itself. The constants should probably be consistent
with the class name, too, like XXX_ALLOCATION_SITE_INFO.

[mvstanton, 2013/01/04 12:07:52]

Done.

+  
   FastCloneShallowArrayStub(Mode mode, int length)
       : mode_(mode),
         length_((mode == COPY_ON_WRITE_ELEMENTS) ? 0 : length) {
@@ -445,8 +454,8 @@ class FastCloneShallowArrayStub : public PlatformCodeStub {
 
   Major MajorKey() { return FastCloneShallowArray; }
   int MinorKey() {
-    ASSERT(mode_ == 0 || mode_ == 1 || mode_ == 2 || mode_ == 3);
-    return length_ * 4 +  mode_;
+    ASSERT(mode_ >= 0 && mode_ <= LAST_CLONE_MODE);
+    return length_ * kFastCloneModeCount + mode_;
   }
 };