Remove a dead method from lithium-* files.

src/mips/lithium-mips.cc

 // 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 563 matching lines @@
     va_list arguments;
     va_start(arguments, format);
     OS::VPrint(format, arguments);
     va_end(arguments);
     PrintF("\n");
   }
   status_ = ABORTED;
 }
 
 
-LRegister* LChunkBuilder::ToOperand(Register reg) {
-  return LRegister::Create(Register::ToAllocationIndex(reg));
-}
-
-
 LUnallocated* LChunkBuilder::ToUnallocated(Register reg) {
   return new LUnallocated(LUnallocated::FIXED_REGISTER,
                           Register::ToAllocationIndex(reg));
 }
 
 
 LUnallocated* LChunkBuilder::ToUnallocated(DoubleRegister reg) {
   return new LUnallocated(LUnallocated::FIXED_DOUBLE_REGISTER,
                           DoubleRegister::ToAllocationIndex(reg));
 }
@@ skipping 1674 matching lines @@
 
 LInstruction* LChunkBuilder::DoIn(HIn* instr) {
   LOperand* key = UseRegisterAtStart(instr->key());
   LOperand* object = UseRegisterAtStart(instr->object());
   LIn* result = new LIn(key, object);
   return MarkAsCall(DefineFixed(result, v0), instr);
 }
 
 
 } }  // namespace v8::internal