[runtime] Avoid @@isConcatSpreadable lookup for fast path Array.prototype.concat

src/elements.h

Index: src/elements.h
diff --git a/src/elements.h b/src/elements.h
index 2b18ab07d12066cfb53fde8f8501b8698d6af752..89edf7214536e902b1b17ef11c4d0449dc5363bf 100644
--- a/src/elements.h
+++ b/src/elements.h
@@ -135,7 +135,7 @@ class ElementsAccessor {
                    uint32_t new_capacity) = 0;
 
   static Handle<JSArray> Concat(Isolate* isolate, Arguments* args,
-                                uint32_t concat_size);
+                                uint32_t concat_size, uint32_t result_length);
 
   virtual uint32_t Push(Handle<JSArray> receiver, Arguments* args,
                         uint32_t push_size) = 0;