Implement tracking and optimizations of packed arrays.

src/ia32/ic-ia32.cc

Index: src/ia32/ic-ia32.cc
diff --git a/src/ia32/ic-ia32.cc b/src/ia32/ic-ia32.cc
index 33f247a349e0641b60c57bb56c67f80ed831d6aa..1a030b85c213d802cd1b0efc3b1980bebd545121 100644
--- a/src/ia32/ic-ia32.cc
+++ b/src/ia32/ic-ia32.cc
@@ -897,9 +897,9 @@ void KeyedStoreIC::GenerateGeneric(MacroAssembler* masm,
               &non_double_value,
               DONT_DO_SMI_CHECK);
 
-  // Value is a double. Transition FAST_SMI_ONLY_ELEMENTS ->
-  // FAST_DOUBLE_ELEMENTS and complete the store.
-  __ LoadTransitionedArrayMapConditional(FAST_SMI_ONLY_ELEMENTS,
+  // Value is a double. Transition Smi elements ->
+  // double and complete the store.
+  __ LoadTransitionedArrayMapConditional(FAST_SMI_ELEMENTS,
                                          FAST_DOUBLE_ELEMENTS,
                                          ebx,
                                          edi,
@@ -910,12 +910,12 @@ void KeyedStoreIC::GenerateGeneric(MacroAssembler* masm,
 
   __ bind(&non_double_value);
   // Value is not a double, FAST_SMI_ONLY_ELEMENTS -> FAST_ELEMENTS
-  __ LoadTransitionedArrayMapConditional(FAST_SMI_ONLY_ELEMENTS,
+  __ LoadTransitionedArrayMapConditional(FAST_SMI_ELEMENTS,
                                          FAST_ELEMENTS,
                                          ebx,
                                          edi,
                                          &slow);
-  ElementsTransitionGenerator::GenerateSmiOnlyToObject(masm);
+  ElementsTransitionGenerator::GenerateMapChangeElementTransition(masm);
   __ mov(ebx, FieldOperand(edx, JSObject::kElementsOffset));
   __ jmp(&finish_object_store);