Basic support for tracking smi-only arrays on ia32.

src/x64/stub-cache-x64.cc

Index: src/x64/stub-cache-x64.cc
diff --git a/src/x64/stub-cache-x64.cc b/src/x64/stub-cache-x64.cc
index 2ef61783e780e6b5dfe22bd6b89358c0d4d16ebe..40ce28fdd56bcb467df6d1b9850e36f1e37420ac 100644
--- a/src/x64/stub-cache-x64.cc
+++ b/src/x64/stub-cache-x64.cc
@@ -3464,6 +3464,7 @@ void KeyedStoreStubCompiler::GenerateStoreExternalArray(
       __ movsd(Operand(rbx, rdi, times_8, 0), xmm0);
       break;
     case FAST_ELEMENTS:
+    case FAST_SMI_ONLY_ELEMENTS:
     case FAST_DOUBLE_ELEMENTS:
     case DICTIONARY_ELEMENTS:
     case NON_STRICT_ARGUMENTS_ELEMENTS:
@@ -3531,6 +3532,7 @@ void KeyedStoreStubCompiler::GenerateStoreExternalArray(
         case EXTERNAL_FLOAT_ELEMENTS:
         case EXTERNAL_DOUBLE_ELEMENTS:
         case FAST_ELEMENTS:
+        case FAST_SMI_ONLY_ELEMENTS:
         case FAST_DOUBLE_ELEMENTS:
         case DICTIONARY_ELEMENTS:
         case NON_STRICT_ARGUMENTS_ELEMENTS:
@@ -3662,8 +3664,10 @@ void KeyedLoadStubCompiler::GenerateLoadFastDoubleElement(
 }
 
 
-void KeyedStoreStubCompiler::GenerateStoreFastElement(MacroAssembler* masm,
-                                                      bool is_js_array) {
+void KeyedStoreStubCompiler::GenerateStoreFastElement(
+    MacroAssembler* masm,
+    bool is_js_array,
+    StoreObjectAction store_object_action) {
   // ----------- S t a t e -------------
   //  -- rax    : value
   //  -- rcx    : key
@@ -3700,6 +3704,7 @@ void KeyedStoreStubCompiler::GenerateStoreFastElement(MacroAssembler* masm,
   __ movq(Operand(rcx, 0), rax);
   // Make sure to preserve the value in register rax.
   __ movq(rdx, rax);
+  ASSERT(store_object_action == kObjectStoreCausesWriteBarrier);
   __ RecordWrite(rdi, rcx, rdx, kDontSaveFPRegs);
 
   // Done.