Revert of Use a WeakCell in the CallIC type vector.

src/type-info.cc

Index: src/type-info.cc
diff --git a/src/type-info.cc b/src/type-info.cc
index 01943414a7cb60d8495bab94a0adacf13149dd4b..096e383c94f8e918cc15dbc6f21639f6d40d943c 100644
--- a/src/type-info.cc
+++ b/src/type-info.cc
@@ -62,23 +62,12 @@
 
 Handle<Object> TypeFeedbackOracle::GetInfo(FeedbackVectorICSlot slot) {
   DCHECK(slot.ToInt() >= 0 && slot.ToInt() < feedback_vector_->length());
-  Handle<Object> undefined =
-      Handle<Object>::cast(isolate()->factory()->undefined_value());
   Object* obj = feedback_vector_->Get(slot);
-
-  // Vector-based ICs do not embed direct pointers to maps, functions.
-  // Instead a WeakCell is always used.
-  if (obj->IsWeakCell()) {
-    WeakCell* cell = WeakCell::cast(obj);
-    if (cell->cleared()) return undefined;
-    obj = cell->value();
-  }
-
   if (!obj->IsJSFunction() ||
       !CanRetainOtherContext(JSFunction::cast(obj), *native_context_)) {
     return Handle<Object>(obj, isolate());
   }
-  return undefined;
+  return Handle<Object>::cast(isolate()->factory()->undefined_value());
 }