Fix polymorphic inlined calls with migrating prototypes

src/ast.cc

Index: src/ast.cc
diff --git a/src/ast.cc b/src/ast.cc
index aeb767ef0c983293cb1b28fb94b1a6efb5aaff44..681b3d46b860784992bac460a5adcc65b592f0dc 100644
--- a/src/ast.cc
+++ b/src/ast.cc
@@ -137,7 +137,6 @@ Assignment::Assignment(Isolate* isolate,
       value_(value),
       binary_operation_(NULL),
       assignment_id_(GetNextId(isolate)),
-      is_monomorphic_(false),
       is_uninitialized_(false),
       is_pre_monomorphic_(false),
       store_mode_(STANDARD_STORE) { }
@@ -742,8 +741,10 @@ void CallNew::RecordTypeFeedback(TypeFeedbackOracle* oracle) {
 
 void ObjectLiteral::Property::RecordTypeFeedback(TypeFeedbackOracle* oracle) {
   TypeFeedbackId id = key()->LiteralFeedbackId();
-  receiver_type_ = oracle->ObjectLiteralStoreIsMonomorphic(id)
-      ? oracle->GetObjectLiteralStoreMap(id) : Handle<Map>::null();
+  SmallMapList maps;
+  oracle->CollectReceiverTypes(id, &maps);
+  receiver_type_ = maps.length() == 1 ? maps.at(0)
+                                      : Handle<Map>::null();
 }