Use shorting encoding for mov reg, imm.

src/assembler-ia32.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 435 matching lines @@
 
   // Moves
   void mov_b(Register dst, const Operand& src);
   void mov_b(const Operand& dst, int8_t imm8);
   void mov_b(const Operand& dst, Register src);
 
   void mov_w(Register dst, const Operand& src);
   void mov_w(const Operand& dst, Register src);
 
   void mov(Register dst, int32_t imm32);
+  void mov(Register dst, const Immediate& x);
   void mov(Register dst, Handle<Object> handle);
   void mov(Register dst, const Operand& src);
+  void mov(Register dst, Register src);
   void mov(const Operand& dst, const Immediate& x);
   void mov(const Operand& dst, Handle<Object> handle);
   void mov(const Operand& dst, Register src);
 
   void movsx_b(Register dst, const Operand& src);
 
   void movsx_w(Register dst, const Operand& src);
 
   void movzx_b(Register dst, const Operand& src);
 
@@ skipping 333 matching lines @@
  private:
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ASSEMBLER_IA32_H_