Replace movq with movp for X64 when the operand size is kPointerSize

src/x64/macro-assembler-x64.h

 // 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 703 matching lines @@
   // Sets flags as a normal add.
   void AddSmiField(Register dst, const Operand& src);
 
   // Basic Smi operations.
   void Move(Register dst, Smi* source) {
     LoadSmiConstant(dst, source);
   }
 
   void Move(const Operand& dst, Smi* source) {
     Register constant = GetSmiConstant(source);
-    movq(dst, constant);
+    movp(dst, constant);
   }
 
   void Push(Smi* smi);
 
   // Save away a 64-bit integer on the stack as two 32-bit integers
   // masquerading as smis so that the garbage collector skips visiting them.
   void PushInt64AsTwoSmis(Register src, Register scratch = kScratchRegister);
   // Reconstruct a 64-bit integer from two 32-bit integers masquerading as
   // smis on the top of stack.
   void PopInt64AsTwoSmis(Register dst, Register scratch = kScratchRegister);
@@ skipping 880 matching lines @@
     masm->popfq();                                                           \
   }                                                                          \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_MACRO_ASSEMBLER_X64_H_