Implement tracking and optimizations of packed arrays.

src/ia32/stub-cache-ia32.cc

Index: src/ia32/stub-cache-ia32.cc
diff --git a/src/ia32/stub-cache-ia32.cc b/src/ia32/stub-cache-ia32.cc
index f8fb72192f1026eb3409d2a1508df3851ce676a9..865ec7a208d8e89cd24e792b7159c43821b59771 100644
--- a/src/ia32/stub-cache-ia32.cc
+++ b/src/ia32/stub-cache-ia32.cc
@@ -1452,12 +1452,13 @@ Handle<Code> CallStubCompiler::CompileArrayPushCall(
         // edi: elements array
         // edx: receiver
         // ebx: map
-        __ LoadTransitionedArrayMapConditional(FAST_SMI_ONLY_ELEMENTS,
+        __ LoadTransitionedArrayMapConditional(FAST_SMI_ELEMENTS,
                                                FAST_ELEMENTS,
                                                ebx,
                                                edi,
                                                &call_builtin);
-        ElementsTransitionGenerator::GenerateSmiOnlyToObject(masm());
+        ElementsTransitionGenerator::
+            GenerateMapChangeElementTransition(masm());
         // Restore edi.
         __ mov(edi, FieldOperand(edx, JSArray::kElementsOffset));
         __ bind(&fast_object);
@@ -3816,7 +3817,7 @@ void KeyedStoreStubCompiler::GenerateStoreFastElement(
   // Check that the key is a smi or a heap number convertible to a smi.
   GenerateSmiKeyCheck(masm, ecx, ebx, xmm0, xmm1, &miss_force_generic);
 
-  if (elements_kind == FAST_SMI_ONLY_ELEMENTS) {
+  if (IsFastSmiElementsKind(elements_kind)) {
     __ JumpIfNotSmi(eax, &transition_elements_kind);
   }
 
@@ -3841,7 +3842,7 @@ void KeyedStoreStubCompiler::GenerateStoreFastElement(
   __ j(not_equal, &miss_force_generic);
 
   __ bind(&finish_store);
-  if (elements_kind == FAST_SMI_ONLY_ELEMENTS) {
+  if (IsFastSmiElementsKind(elements_kind)) {
     // ecx is a smi, use times_half_pointer_size instead of
     // times_pointer_size
     __ mov(FieldOperand(edi,
@@ -3849,7 +3850,7 @@ void KeyedStoreStubCompiler::GenerateStoreFastElement(
                         times_half_pointer_size,
                         FixedArray::kHeaderSize), eax);
   } else {
-    ASSERT(elements_kind == FAST_ELEMENTS);
+    ASSERT(IsFastObjectElementsKind(elements_kind));
     // Do the store and update the write barrier.
     // ecx is a smi, use times_half_pointer_size instead of
     // times_pointer_size