[turbofan] Fix Promise.resolve() lowering.

It seems that the Promise.resolve() lowering in JSCallReducer was no
longer called.

Bug: v8:7253
Change-Id: I3c80aed085d15fb54d88245b9d71b9caed7de075
Reviewed-on: https://chromium-review.googlesource.com/c/1288452Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56773}

src/compiler/js-call-reducer.cc

@@ -3663,6 +3663,8 @@ Reduction JSCallReducer::ReduceJSCall(Node* node,
       return ReducePromisePrototypeFinally(node);
     case Builtins::kPromisePrototypeThen:
       return ReducePromisePrototypeThen(node);
+    case Builtins::kPromiseResolveTrampoline:
+      return ReducePromiseResolveTrampoline(node);
     case Builtins::kMapPrototypeEntries:
       return ReduceCollectionIteration(node, CollectionKind::kMap,
                                        IterationKind::kEntries);