Improve polymorphic loads on single slots.

src/mips/lithium-codegen-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 4123 matching lines @@
                                 Handle<Map> map,
                                 CompareMapMode mode,
                                 LEnvironment* env) {
   Label success;
   __ CompareMapAndBranch(reg, scratch, map, &success, eq, &success, mode);
   DeoptimizeIf(al, env);
   __ bind(&success);
 }
 
 
-void LCodeGen::DoCheckMap(LCheckMap* instr) {
+void LCodeGen::DoCheckMaps(LCheckMaps* instr) {
   Register scratch = scratch0();
   LOperand* input = instr->InputAt(0);
   ASSERT(input->IsRegister());
   Register reg = ToRegister(input);
   Handle<Map> map = instr->hydrogen()->map();
   DoCheckMapCommon(reg, scratch, map, instr->hydrogen()->mode(),
                    instr->environment());
 }
 
 
@@ skipping 796 matching lines @@
   __ Subu(scratch, result, scratch);
   __ lw(result, FieldMemOperand(scratch,
                                 FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal