[x64] Make xmm0 allocatable and use xmm15 as scratch register instead.

src/ic/x64/ic-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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/codegen.h"
 #include "src/ic/ic.h"
 #include "src/ic/ic-compiler.h"
 #include "src/ic/stub-cache.h"
@@ skipping 433 matching lines @@
 
   // HOLECHECK: guards "A[i] double hole?"
   // We have to see if the double version of the hole is present. If so
   // go to the runtime.
   uint32_t offset = FixedDoubleArray::kHeaderSize + sizeof(kHoleNanLower32);
   __ cmpl(FieldOperand(rbx, key, times_8, offset), Immediate(kHoleNanUpper32));
   __ j(not_equal, &fast_double_without_map_check);
   __ JumpIfDictionaryInPrototypeChain(receiver, rdi, kScratchRegister, slow);
 
   __ bind(&fast_double_without_map_check);
-  __ StoreNumberToDoubleElements(value, rbx, key, xmm0,
+  __ StoreNumberToDoubleElements(value, rbx, key, kScratchDoubleReg,
                                  &transition_double_elements);
   if (increment_length == kIncrementLength) {
     // Add 1 to receiver->length.
     __ leal(rdi, Operand(key, 1));
     __ Integer32ToSmiField(FieldOperand(receiver, JSArray::kLengthOffset), rdi);
   }
   __ ret(0);
 
   __ bind(&transition_smi_elements);
   __ movp(rbx, FieldOperand(receiver, HeapObject::kMapOffset));
@@ skipping 381 matching lines @@
   Condition cc =
       (check == ENABLE_INLINED_SMI_CHECK)
           ? (*jmp_address == Assembler::kJncShortOpcode ? not_zero : zero)
           : (*jmp_address == Assembler::kJnzShortOpcode ? not_carry : carry);
   *jmp_address = static_cast<byte>(Assembler::kJccShortPrefix | cc);
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64