[heap] GcAndSweep needs safepoint for EnsureSweepingCompleted()

Bug: v8:10315
Change-Id: Id7d5600e07cd0dfbce409925acf6047e019f501c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2352769Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69370}

test/cctest/heap/heap-utils.cc

@@ -206,6 +206,7 @@ void AbandonCurrentlyFreeMemory(PagedSpace* space) {
 void GcAndSweep(Heap* heap, AllocationSpace space) {
   heap->CollectGarbage(space, GarbageCollectionReason::kTesting);
   if (heap->mark_compact_collector()->sweeping_in_progress()) {
+    SafepointScope scope(heap);
     heap->mark_compact_collector()->EnsureSweepingCompleted();
   }
 }