Fix casting error for receiver of interceptors.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index c2220860b779f7f9ae710adc273046f1e7aabf82..be25736b13254b42451212697d58fdf5c5aa2f3e 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1687,15 +1687,15 @@ class JSObject: public JSReceiver {
       String* name,
       PropertyAttributes* attributes);
   MUST_USE_RESULT MaybeObject* GetPropertyWithInterceptor(
-      JSReceiver* receiver,
+      Object* receiver,
       String* name,
       PropertyAttributes* attributes);
   MUST_USE_RESULT MaybeObject* GetPropertyPostInterceptor(
-      JSReceiver* receiver,
+      Object* receiver,
       String* name,
       PropertyAttributes* attributes);
   MUST_USE_RESULT MaybeObject* GetLocalPropertyPostInterceptor(
-      JSReceiver* receiver,
+      Object* receiver,
       String* name,
       PropertyAttributes* attributes);