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

src/code-stubs.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 398 matching lines @@
 }
 
 
 bool ToBooleanStub::Types::CanBeUndetectable() const {
   return Contains(ToBooleanStub::SPEC_OBJECT)
       || Contains(ToBooleanStub::STRING);
 }
 
 
 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);
     } else if (from_ == FAST_DOUBLE_ELEMENTS) {
       GenerateDoubleToObject(masm, strict_mode_);
     } else {
       UNREACHABLE();
     }
     KeyedStoreStubCompiler::GenerateStoreFastElement(masm,
                                                      is_jsarray_,
                                                      FAST_ELEMENTS);
   } else if (from_ == FAST_SMI_ONLY_ELEMENTS && to_ == FAST_DOUBLE_ELEMENTS) {
     GenerateSmiOnlyToDouble(masm, strict_mode_);
     KeyedStoreStubCompiler::GenerateStoreFastDoubleElement(masm, is_jsarray_);
   } else {
     UNREACHABLE();
   }
 #else
   KeyedStoreIC::GenerateRuntimeSetProperty(masm, strict_mode_);
-#endif  // V8_TARGET_ARCH_IA32
+#endif  // V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X64
 }
 
 } }  // namespace v8::internal