[x64] simply tweak materialization of float/double constants

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 405 matching lines @@
     __ movdqa(xmm0, Operand(rbx, rcx, times_4, 10000));
     __ movdqa(Operand(rbx, rcx, times_4, 10000), xmm0);
 
     __ addsd(xmm1, xmm0);
     __ mulsd(xmm1, xmm0);
     __ subsd(xmm1, xmm0);
     __ divsd(xmm1, xmm0);
     __ ucomisd(xmm0, xmm1);
 
     __ andpd(xmm0, xmm1);
+
+    __ pslld(xmm0, 6);
+    __ psrld(xmm0, 6);
+    __ psllq(xmm0, 6);
+    __ psrlq(xmm0, 6);
+
+    __ pcmpeqd(xmm1, xmm0);
   }
 
   // cmov.
   {
     __ cmovq(overflow, rax, Operand(rax, 0));
     __ cmovq(no_overflow, rax, Operand(rax, 1));
     __ cmovq(below, rax, Operand(rax, 2));
     __ cmovq(above_equal, rax, Operand(rax, 3));
     __ cmovq(equal, rax, Operand(rbx, 0));
     __ cmovq(not_equal, rax, Operand(rbx, 1));
@@ skipping 39 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 __