Partial revert of "Next bunch of fixes for check elimination".

src/mips/lithium-codegen-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.7
 // 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 1721 matching lines @@
 
 
 void LCodeGen::DoConstantE(LConstantE* instr) {
   __ li(ToRegister(instr->result()), Operand(instr->value()));
 }
 
 
 void LCodeGen::DoConstantT(LConstantT* instr) {
   Handle<Object> object = instr->value(isolate());
   AllowDeferredHandleDereference smi_check;
-  if (instr->hydrogen()->HasObjectMap()) {
-    Handle<Map> object_map = instr->hydrogen()->ObjectMap().handle();
-    ASSERT(object->IsHeapObject());
-    ASSERT(!object_map->is_stable() ||
-           *object_map == Handle<HeapObject>::cast(object)->map());
-    USE(object_map);
-  }
   __ li(ToRegister(instr->result()), object);
 }
 
 
 void LCodeGen::DoMapEnumLength(LMapEnumLength* instr) {
   Register result = ToRegister(instr->result());
   Register map = ToRegister(instr->value());
   __ EnumLength(result, map);
 }
 
@@ skipping 4164 matching lines @@
   __ lw(result, FieldMemOperand(scratch,
                                 FixedArray::kHeaderSize - kPointerSize));
   __ bind(deferred->exit());
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal