[heap] Skip unswept pages for CheckPossiblyEmptyBuckets

Sweeping was already restarted, ignore chunks that might be swept
concurrently.

Bug: chromium:1174007
Change-Id: I954bf4b25ddb27a612b9fd33bad1f1ba34358719
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2674005Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72529}

src/heap/scavenger.cc

@@ -410,7 +410,13 @@ void ScavengerCollector::CollectGarbage() {
     MemoryChunk* chunk;
 
     while (empty_chunks.Pop(kMainThreadId, &chunk)) {
-      RememberedSet<OLD_TO_NEW>::CheckPossiblyEmptyBuckets(chunk);
+      // Since sweeping was already restarted only check chunks that already got
+      // swept.
+      if (chunk->SweepingDone()) {
+        RememberedSet<OLD_TO_NEW>::CheckPossiblyEmptyBuckets(chunk);
+      } else {
+        chunk->possibly_empty_buckets()->Release();
+      }
     }
 
 #ifdef DEBUG