Add interceptor support for symbols

src/elements.h

Index: src/elements.h
diff --git a/src/elements.h b/src/elements.h
index f4de4bb010d560a695a3db9aa6576e95f283fe74..9d86bbd657b5fde617ec05381de9e51cc06e1202 100644
--- a/src/elements.h
+++ b/src/elements.h
@@ -167,17 +167,14 @@ class ElementsAccessor {
   }
 
   MUST_USE_RESULT virtual MaybeHandle<FixedArray> AddElementsToFixedArray(
-      Handle<Object> receiver,
-      Handle<JSObject> holder,
-      Handle<FixedArray> to,
-      Handle<FixedArrayBase> from) = 0;
+      Handle<Object> receiver, Handle<JSObject> holder, Handle<FixedArray> to,
+      Handle<FixedArrayBase> from, FixedArray::KeyFilter filter) = 0;
 
   MUST_USE_RESULT inline MaybeHandle<FixedArray> AddElementsToFixedArray(
-      Handle<Object> receiver,
-      Handle<JSObject> holder,
-      Handle<FixedArray> to) {
-    return AddElementsToFixedArray(
-        receiver, holder, to, handle(holder->elements()));
+      Handle<Object> receiver, Handle<JSObject> holder, Handle<FixedArray> to,
+      FixedArray::KeyFilter filter) {
+    return AddElementsToFixedArray(receiver, holder, to,
+                                   handle(holder->elements()), filter);
   }
 
   // Returns a shared ElementsAccessor for the specified ElementsKind.