Expose receiver check type in call type feedback.

src/ast.h

Index: src/ast.h
diff --git a/src/ast.h b/src/ast.h
index ba422fdaf38dbfadc51dd55559525b5571375059..d191ebfa76cbd65d0b66fec8cb6981b777fbac6c 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -1268,6 +1268,7 @@ class Call: public Expression {
         arguments_(arguments),
         pos_(pos),
         is_monomorphic_(false),
+        check_type_(RECEIVER_MAP_CHECK),
         receiver_types_(NULL),
         return_id_(GetNextId()) {
   }
@@ -1283,6 +1284,7 @@ class Call: public Expression {
   void RecordTypeFeedback(TypeFeedbackOracle* oracle);
   virtual ZoneMapList* GetReceiverTypes() { return receiver_types_; }
   virtual bool IsMonomorphic() { return is_monomorphic_; }
+  CheckType check_type() const { return check_type_; }
   Handle<JSFunction> target() { return target_; }
   Handle<JSObject> holder() { return holder_; }
   Handle<JSGlobalPropertyCell> cell() { return cell_; }
@@ -1306,6 +1308,7 @@ class Call: public Expression {
   int pos_;
 
   bool is_monomorphic_;
+  CheckType check_type_;
   ZoneMapList* receiver_types_;
   Handle<JSFunction> target_;
   Handle<JSObject> holder_;