Avoid using double temp register explicitly in lithium codegen

src/ia32/lithium-ia32.h

 // Copyright 2012 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 2490 matching lines @@
   }
 
   LOperand* unclamped() { return inputs_[0]; }
 
   DECLARE_CONCRETE_INSTRUCTION(ClampIToUint8, "clamp-i-to-uint8")
 };
 
 
 class LClampTToUint8 V8_FINAL : public LTemplateInstruction<1, 1, 1> {
  public:
-  LClampTToUint8(LOperand* value, LOperand* temp) {
+  LClampTToUint8(LOperand* value, LOperand* temp_xmm) {
     inputs_[0] = value;
-    temps_[0] = temp;
+    temps_[0] = temp_xmm;
   }
 
   LOperand* unclamped() { return inputs_[0]; }
+  LOperand* temp_xmm() { return temps_[0]; }
 
   DECLARE_CONCRETE_INSTRUCTION(ClampTToUint8, "clamp-t-to-uint8")
 };
 
 
 // Truncating conversion from a tagged value to an int32.
 class LClampTToUint8NoSSE2 V8_FINAL : public LTemplateInstruction<1, 1, 3> {
  public:
   LClampTToUint8NoSSE2(LOperand* unclamped,
                        LOperand* temp1,
@@ skipping 393 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_LITHIUM_IA32_H_