Get rid of the TRANSITION PropertyType and consistently use CanHoldValue().

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 41fe7b155136aa3759f679181bcdf982b1ea11ff..43d23545efb1bcd6441a9fd39f1c77047974fce0 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -2629,15 +2629,9 @@ void Map::LookupDescriptor(JSObject* holder,
 void Map::LookupTransition(JSObject* holder,
                            Name* name,
                            LookupResult* result) {
-  if (HasTransitionArray()) {
-    TransitionArray* transition_array = transitions();
-    int number = transition_array->Search(name);
-    if (number != TransitionArray::kNotFound) {
-      return result->TransitionResult(
-          holder, transition_array->GetTarget(number));
-    }
-  }
-  result->NotFound();
+  int transition_index = this->SearchTransition(name);
+  if (transition_index == TransitionArray::kNotFound) return result->NotFound();
+  result->TransitionResult(holder, this->GetTransition(transition_index));
 }
 
 
@@ -4904,6 +4898,12 @@ Map* Map::GetTransition(int transition_index) {
 }
 
 
+int Map::SearchTransition(Name* name) {
+  if (HasTransitionArray()) return transitions()->Search(name);
+  return TransitionArray::kNotFound;
+}
+
+
 MaybeObject* Map::set_elements_transition_map(Map* transitioned_map) {
   TransitionArray* transitions;
   MaybeObject* maybe_transitions = AddTransition(