Make tests pass with weak closure overapproximation enabled

test/cctest/test-heap.cc

Index: test/cctest/test-heap.cc
diff --git a/test/cctest/test-heap.cc b/test/cctest/test-heap.cc
index d46d59a9128553f96d0c709cd22cd8c5c237d9e8..0e6776cbe95724b4ad94494766c2028a9e47ab6f 100644
--- a/test/cctest/test-heap.cc
+++ b/test/cctest/test-heap.cc
@@ -2341,6 +2341,8 @@ TEST(IdleNotificationFinishMarking) {
     CHECK(!marking->IsIdleMarkingDelayCounterLimitReached());
   }
 
+  marking->SetWeakClosureWasOverApproximatedForTesting(true);
+
   // The next idle notification has to finish incremental marking.
   const int kLongIdleTime = 1000000;
   CcTest::isolate()->IdleNotification(kLongIdleTime);
@@ -4065,7 +4067,8 @@ TEST(IncrementalMarkingStepMakesBigProgressWithLargeObjects) {
   if (marking->IsStopped()) marking->Start();
   // This big step should be sufficient to mark the whole array.
   marking->Step(100 * MB, IncrementalMarking::NO_GC_VIA_STACK_GUARD);
-  DCHECK(marking->IsComplete());
+  DCHECK(marking->IsComplete() ||
+         marking->IsReadyToOverApproximateWeakClosure());
 }