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

src/x64/codegen-x64.cc

 // Copyright 2012 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.
 
 #include "src/x64/codegen-x64.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/codegen.h"
 #include "src/macro-assembler.h"
@@ skipping 586 matching lines @@
   DCHECK(!input.is(double_scratch));
   DCHECK(!result.is(double_scratch));
   DCHECK(!temp1.is(temp2));
   DCHECK(ExternalReference::math_exp_constants(0).address() != NULL);
   DCHECK(!masm->serializer_enabled());  // External references not serializable.
 
   Label done;
 
   __ Move(kScratchRegister, ExternalReference::math_exp_constants(0));
   __ Movsd(double_scratch, Operand(kScratchRegister, 0 * kDoubleSize));
-  __ xorpd(result, result);
+  __ Xorpd(result, result);
   __ ucomisd(double_scratch, input);
   __ j(above_equal, &done);
   __ ucomisd(input, Operand(kScratchRegister, 1 * kDoubleSize));
   __ Movsd(result, Operand(kScratchRegister, 2 * kDoubleSize));
   __ j(above_equal, &done);
   __ Movsd(double_scratch, Operand(kScratchRegister, 3 * kDoubleSize));
   __ Movsd(result, Operand(kScratchRegister, 4 * kDoubleSize));
   __ mulsd(double_scratch, input);
   __ addsd(double_scratch, result);
   __ Movq(temp2, double_scratch);
@@ skipping 102 matching lines @@
     return Operand(base_reg_, argument_count_reg_, times_pointer_size,
         displacement_to_last_argument + (receiver - 1 - index) * kPointerSize);
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64