Fix ArrayConcat for JSValues/JSFunctions/JSRegExps with @@isConcatSpreadable

src/runtime/runtime.h

Index: src/runtime/runtime.h
diff --git a/src/runtime/runtime.h b/src/runtime/runtime.h
index 9e6c495162c81fd5532b6b8a26b5d286c30d0e24..d745a5b4d41a85a8da7af99c34b98c3f4defb005 100644
--- a/src/runtime/runtime.h
+++ b/src/runtime/runtime.h
@@ -851,6 +851,9 @@ class Runtime : public AllStatic {
   static void FreeArrayBuffer(Isolate* isolate,
                               JSArrayBuffer* phantom_array_buffer);
 
+  static Handle<JSArray> StringToArray(Isolate* isolate, Handle<String> string,
+                                       uint32_t limit = 0xFFFFFFFF);
+
   static int FindIndexedNonNativeFrame(JavaScriptFrameIterator* it, int index);
 
   enum TypedArrayId {