Ensure lazy sweeping is complete before simulating incremental marking in test-heap.

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 b3058f764d83331c10a7f3e7589982c0b3d2333c..6b6d1e32ac091034fb8de525770c1cf6216269b1 100644
--- a/test/cctest/test-heap.cc
+++ b/test/cctest/test-heap.cc
@@ -45,6 +45,9 @@ using namespace v8::internal;
 static void SimulateIncrementalMarking() {
   MarkCompactCollector* collector = CcTest::heap()->mark_compact_collector();
   IncrementalMarking* marking = CcTest::heap()->incremental_marking();
+  while (!CcTest::heap()->old_pointer_space()->IsLazySweepingComplete()) {
+    CcTest::heap()->old_pointer_space()->AdvanceSweeper(KB);
+  }
   if (collector->IsConcurrentSweepingInProgress()) {
     collector->WaitUntilSweepingCompleted();
   }