MIPS: Fix and simplify code aging.

src/mips/simulator-mips.h

 // Copyright 2011 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 271 matching lines @@
 
   // Executing is handled based on the instruction type.
   void DecodeTypeRegister(Instruction* instr);
 
   // Helper function for DecodeTypeRegister.
   void ConfigureTypeRegister(Instruction* instr,
                              int32_t& alu_out,
                              int64_t& i64hilo,
                              uint64_t& u64hilo,
                              int32_t& next_pc,
+                             int32_t& return_addr_reg,
                              bool& do_interrupt);
 
   void DecodeTypeImmediate(Instruction* instr);
   void DecodeTypeJump(Instruction* instr);
 
   // Used for breakpoints and traps.
   void SoftwareInterrupt(Instruction* instr);
 
   // Stop helper functions.
   bool IsWatchpoint(uint32_t code);
@@ skipping 130 matching lines @@
 
   static inline void UnregisterCTryCatch() {
     Simulator::current(Isolate::Current())->PopAddress();
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // !defined(USE_SIMULATOR)
 #endif  // V8_MIPS_SIMULATOR_MIPS_H_