Keep prototype maps in dictionary mode until ICs see them

src/runtime/runtime-debug.cc

Index: src/runtime/runtime-debug.cc
diff --git a/src/runtime/runtime-debug.cc b/src/runtime/runtime-debug.cc
index e02a58212176911f119d25499502955e7db9f7bc..d5a7639fbef8b4410f9be24b3bd59308faaadfc5 100644
--- a/src/runtime/runtime-debug.cc
+++ b/src/runtime/runtime-debug.cc
@@ -1196,7 +1196,7 @@ RUNTIME_FUNCTION(Runtime_DebugGetLoadedScripts) {
 static bool HasInPrototypeChainIgnoringProxies(Isolate* isolate,
                                                JSObject* object,
                                                Object* proto) {
-  PrototypeIterator iter(isolate, object, PrototypeIterator::START_AT_RECEIVER);
+  PrototypeIterator iter(isolate, object, kStartAtReceiver);
   while (true) {
     iter.AdvanceIgnoringProxies();
     if (iter.IsAtEnd()) return false;