Next bunch of fixes for check elimination.

src/ia32/lithium-codegen-ia32.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "v8.h"
 
 #if V8_TARGET_ARCH_IA32
 
 #include "ia32/lithium-codegen-ia32.h"
 #include "ic.h"
@@ skipping 1993 matching lines @@
 }
 
 
 void LCodeGen::DoConstantE(LConstantE* instr) {
   __ lea(ToRegister(instr->result()), Operand::StaticVariable(instr->value()));
 }
 
 
 void LCodeGen::DoConstantT(LConstantT* instr) {
   Register reg = ToRegister(instr->result());
-  Handle<Object> handle = instr->value(isolate());
+  Handle<Object> object = instr->value(isolate());
   AllowDeferredHandleDereference smi_check;
-  __ LoadObject(reg, handle);
+  if (instr->hydrogen()->HasObjectMap()) {
+    Handle<Map> object_map = instr->hydrogen()->ObjectMap().handle();
+    CHECK(object->IsHeapObject());
+    CHECK(!object_map->is_stable() ||
+          *object_map == Handle<HeapObject>::cast(object)->map());
+  }
+  __ LoadObject(reg, object);
 }
 
 
 void LCodeGen::DoMapEnumLength(LMapEnumLength* instr) {
   Register result = ToRegister(instr->result());
   Register map = ToRegister(instr->value());
   __ EnumLength(result, map);
 }
 
 
@@ skipping 4397 matching lines @@
   __ bind(deferred->exit());
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32