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

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 6e5e7fb37d7a607004be44aa496c3caadace38e1..3393fb780bf4ae093d27066f3bede4cca878eec7 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -807,11 +807,11 @@ static void AddToWeakNativeContextList(Context* context) {
   Heap* heap = context->GetIsolate()->heap();
 #ifdef DEBUG
   { // NOLINT
-    DCHECK(context->get(Context::NEXT_CONTEXT_LINK)->IsUndefined());
+    DCHECK(context->next_context_link()->IsUndefined());
     // Check that context is not in the list yet.
     for (Object* current = heap->native_contexts_list();
          !current->IsUndefined();
-         current = Context::cast(current)->get(Context::NEXT_CONTEXT_LINK)) {
+         current = Context::cast(current)->next_context_link()) {
       DCHECK(current != context);
     }
   }