[heap] Cleanup: Remove WAS_SWEPT flag.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 9b0198f82578e25064fa94207604ae14537188c7..ea18e92f26629634ce264d02d909b57e856e5b5b 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -3100,7 +3100,7 @@ bool Heap::CanMoveObjectStart(HeapObject* object) {
   // (3) the page was already concurrently swept. This case is an optimization
   // for concurrent sweeping. The WasSwept predicate for concurrently swept
   // pages is set after sweeping all pages.
-  return !InOldSpace(address) || page->WasSwept() || page->SweepingCompleted();
+  return !InOldSpace(address) || page->SweepingCompleted();
 }