Tag all prototypes as proto, except those set using __proto__

src/stub-cache.cc

Index: src/stub-cache.cc
diff --git a/src/stub-cache.cc b/src/stub-cache.cc
index 755f39136d3f9efc085557fc53d401a9ed4bba67..f959e924988a8f0a72ab1e9961b668dbea345328 100644
--- a/src/stub-cache.cc
+++ b/src/stub-cache.cc
@@ -349,7 +349,7 @@ Handle<Code> PropertyICCompiler::ComputeCompareNil(Handle<Map> receiver_map,
                                                    CompareNilICStub* stub) {
   Isolate* isolate = receiver_map->GetIsolate();
   Handle<String> name(isolate->heap()->empty_string());
-  if (!receiver_map->is_shared()) {
+  if (!receiver_map->is_dictionary_map()) {
     Handle<Code> cached_ic =
         Find(name, receiver_map, Code::COMPARE_NIL_IC, stub->GetExtraICState());
     if (!cached_ic.is_null()) return cached_ic;
@@ -359,7 +359,7 @@ Handle<Code> PropertyICCompiler::ComputeCompareNil(Handle<Map> receiver_map,
   pattern.Add(isolate->factory()->meta_map(), receiver_map);
   Handle<Code> ic = stub->GetCodeCopy(pattern);
 
-  if (!receiver_map->is_shared()) {
+  if (!receiver_map->is_dictionary_map()) {
     Map::UpdateCodeCache(receiver_map, name, ic);
   }