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

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
index cc7ef294478ed38144299b60f8cf2c8613d3ee4b..c49b06f2b8300749b294832009290c21c3e36b3b 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -859,6 +859,13 @@ class MacroAssembler: public Assembler {
   // in eax.  Assumes that any other register can be used as a scratch.
   void CheckEnumCache(Label* call_runtime);
 
+  // AllocationSiteInfo support. Arrays may have an associated
+  // AllocationSiteInfo object that can be checked for in order to pretransition
+  // to another type.
+  // On entry, edx should point to the array object. edi gets clobbered.
+  // If allocation info is present, jump to allocation_info_present
+  void PerformAllocationSiteInfoCheck(Label* allocation_info_present);

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

See comments in macro-assembler-arm.h.

+
  private:
   bool generating_stub_;
   bool allow_stub_calls_;