Implement HChange support for Smis and use it in Load/StoreNameField

src/ia32/lithium-codegen-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 93 matching lines @@
     return !NeedsEagerFrame() && info()->is_deferred_calling();
   }
 
   // Support for converting LOperands to assembler types.
   Operand ToOperand(LOperand* op) const;
   Register ToRegister(LOperand* op) const;
   XMMRegister ToDoubleRegister(LOperand* op) const;
   bool IsX87TopOfStack(LOperand* op) const;
 
   bool IsInteger32(LConstantOperand* op) const;
+  bool IsSmi(LConstantOperand* op) const;
   Immediate ToInteger32Immediate(LOperand* op) const {
     return Immediate(ToInteger32(LConstantOperand::cast(op)));
   }
 
   // Support for non-sse2 (x87) floating point stack handling.
   // These functions maintain the depth of the stack (either 0 or 1)
   void PushX87DoubleOperand(Operand src);
   void PushX87FloatOperand(Operand src);
   void ReadX87Operand(Operand dst);
   bool X87StackNonEmpty() const { return x87_stack_depth_ > 0; }
@@ skipping 359 matching lines @@
   LCodeGen* codegen_;
   Label entry_;
   Label exit_;
   Label* external_exit_;
   int instruction_index_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_LITHIUM_CODEGEN_IA32_H_