[x64] Fix REX prefix in shufps

test/cctest/test-disasm-x64.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 368 matching lines @@
   __ nop();
 
   // SSE instruction
   {
     // Move operation
     __ cvttss2si(rdx, Operand(rbx, rcx, times_4, 10000));
     __ cvttss2si(rdx, xmm1);
     __ cvtsd2ss(xmm0, xmm1);
     __ cvtsd2ss(xmm0, Operand(rbx, rcx, times_4, 10000));
     __ movaps(xmm0, xmm1);
+    __ shufps(xmm0, xmm9, 0x0);
 
     // logic operation
     __ andps(xmm0, xmm1);
     __ andps(xmm0, Operand(rbx, rcx, times_4, 10000));
     __ orps(xmm0, xmm1);
     __ orps(xmm0, Operand(rbx, rcx, times_4, 10000));
     __ xorps(xmm0, xmm1);
     __ xorps(xmm0, Operand(rbx, rcx, times_4, 10000));
 
     // Arithmetic operation
@@ skipping 547 matching lines @@
 #ifdef OBJECT_PRINT
   OFStream os(stdout);
   code->Print(os);
   byte* begin = code->instruction_start();
   byte* end = begin + code->instruction_size();
   disasm::Disassembler::Disassemble(stdout, begin, end);
 #endif
 }
 
 #undef __