[turbofan] HeapConstant types should compare by handle address

src/compiler/typed-optimization.cc

 // Copyright 2016 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 "src/compiler/typed-optimization.h"
 
 #include "src/compilation-dependencies.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/simplified-operator.h"
@@ skipping 80 matching lines @@
       return ReduceSelect(node);
     default:
       break;
   }
   return NoChange();
 }
 
 namespace {
 
 MaybeHandle<Map> GetStableMapFromObjectType(Type* object_type) {
-  if (object_type->IsHeapConstant() &&
-      object_type->AsHeapConstant()->Value()->IsHeapObject()) {
-    Handle<Map> object_map(
-        Handle<HeapObject>::cast(object_type->AsHeapConstant()->Value())
-            ->map());
+  if (object_type->IsHeapConstant()) {
+    Handle<Map> object_map(object_type->AsHeapConstant()->Value()->map());
     if (object_map->is_stable()) return object_map;
   }
   return MaybeHandle<Map>();
 }
 
 }  // namespace
 
 Reduction TypedOptimization::ReduceCheckMaps(Node* node) {
   // The CheckMaps(o, ...map...) can be eliminated if map is stable,
   // o has type Constant(object) and map == object->map, and either
@@ skipping 131 matching lines @@
 
 Isolate* TypedOptimization::isolate() const { return jsgraph()->isolate(); }
 
 SimplifiedOperatorBuilder* TypedOptimization::simplified() const {
   return jsgraph()->simplified();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8