[x64] Make use of vxorpd when AVX is enabled.

src/x64/lithium-gap-resolver-x64.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/x64/lithium-codegen-x64.h"
 #include "src/x64/lithium-gap-resolver-x64.h"
 
 namespace v8 {
@@ skipping 171 matching lines @@
           __ Set(dst, static_cast<uint32_t>(constant));
         }
       } else {
         __ Move(dst, cgen_->ToHandle(constant_source));
       }
     } else if (destination->IsDoubleRegister()) {
       double v = cgen_->ToDouble(constant_source);
       uint64_t int_val = bit_cast<uint64_t, double>(v);
       XMMRegister dst = cgen_->ToDoubleRegister(destination);
       if (int_val == 0) {
-        __ xorps(dst, dst);
+        __ Xorpd(dst, dst);
       } else {
         __ Set(kScratchRegister, int_val);
         __ Movq(dst, kScratchRegister);
       }
     } else {
       DCHECK(destination->IsStackSlot());
       Operand dst = cgen_->ToOperand(destination);
       if (cgen_->IsSmiConstant(constant_source)) {
         __ Move(dst, cgen_->ToSmi(constant_source));
       } else if (cgen_->IsInteger32Constant(constant_source)) {
@@ skipping 106 matching lines @@
     }
   }
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64