Porting r9605 to x64 (elements kind conversion in generated code).

src/code-stubs.cc

Index: src/code-stubs.cc
diff --git a/src/code-stubs.cc b/src/code-stubs.cc
index 78585d8f642d8ee044117d1791e5c85b329025e4..a298bc454ee03da76b831a791ab22df6f27dff93 100644
--- a/src/code-stubs.cc
+++ b/src/code-stubs.cc
@@ -416,7 +416,7 @@ bool ToBooleanStub::Types::CanBeUndetectable() const {
 
 
 void FastElementsConversionStub::Generate(MacroAssembler* masm) {
-#if defined(V8_TARGET_ARCH_IA32)
+#if defined(V8_TARGET_ARCH_IA32) || defined(V8_TARGET_ARCH_X64)
   if (to_ == FAST_ELEMENTS) {
     if (from_ == FAST_SMI_ONLY_ELEMENTS) {
       GenerateSmiOnlyToObject(masm);
@@ -436,7 +436,7 @@ void FastElementsConversionStub::Generate(MacroAssembler* masm) {
   }
 #else
   KeyedStoreIC::GenerateRuntimeSetProperty(masm, strict_mode_);
-#endif  // V8_TARGET_ARCH_IA32
+#endif  // V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X64
 }
 
 } }  // namespace v8::internal