Add the VFP-ness to the minor number of the keyed store elements

src/x64/code-stubs-x64.cc

 // Copyright 2012 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 6126 matching lines @@
     RecordWriteStub stub(entry->object,
                          entry->value,
                          entry->address,
                          entry->action,
                          kDontSaveFPRegs);
     stub.GetCode()->set_is_pregenerated(true);
   }
 }
 
 
+bool CodeStub::CanUseFPRegisters() {
+  return true;  // Always have SSE2 on x64.
+}
+
+
 // Takes the input in 3 registers: address_ value_ and object_.  A pointer to
 // the value has just been written into the object, now this stub makes sure
 // we keep the GC informed.  The word in the object where the value has been
 // written is in the address register.
 void RecordWriteStub::Generate(MacroAssembler* masm) {
   Label skip_to_incremental_noncompacting;
   Label skip_to_incremental_compacting;
 
   // The first two instructions are generated with labels so as to get the
   // offset fixed up correctly by the bind(Label*) call.  We patch it back and
@@ skipping 343 matching lines @@
 #endif
 
   __ Ret();
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64