[turbofan] HeapConstant types should compare by handle address

src/compiler/simplified-lowering.cc

Index: src/compiler/simplified-lowering.cc
diff --git a/src/compiler/simplified-lowering.cc b/src/compiler/simplified-lowering.cc
index 379d9ac8a1022f45ec2684c1306e4dcd491599bb..491aed6b6bf0cda71d1fb16c09d135e900ad7fef 100644
--- a/src/compiler/simplified-lowering.cc
+++ b/src/compiler/simplified-lowering.cc
@@ -1031,10 +1031,8 @@ class RepresentationSelector {
         // undefined, because these special oddballs are always in the root set.
         return kNoWriteBarrier;
       }
-      if (value_type->IsHeapConstant() &&
-          value_type->AsHeapConstant()->Value()->IsHeapObject()) {
-        Handle<HeapObject> value_object =
-            Handle<HeapObject>::cast(value_type->AsHeapConstant()->Value());
+      if (value_type->IsHeapConstant()) {
+        Handle<HeapObject> value_object = value_type->AsHeapConstant()->Value();
         RootIndexMap root_index_map(jsgraph_->isolate());
         int root_index = root_index_map.Lookup(*value_object);
         if (root_index != RootIndexMap::kInvalidRootIndex &&