[heap] Refactor incremental marking step.

test/cctest/heap/heap-utils.cc

Index: test/cctest/heap/heap-utils.cc
diff --git a/test/cctest/heap/heap-utils.cc b/test/cctest/heap/heap-utils.cc
index 7d4d4bf40dc31d4d267ab6df5c3e7f18354a2078..f7edc86dbdd6bf2e1ca42542c3907addba83a96b 100644
--- a/test/cctest/heap/heap-utils.cc
+++ b/test/cctest/heap/heap-utils.cc
@@ -125,7 +125,8 @@ void SimulateIncrementalMarking(i::Heap* heap, bool force_completion) {
   if (!force_completion) return;
 
   while (!marking->IsComplete()) {
-    marking->Step(i::MB, i::IncrementalMarking::NO_GC_VIA_STACK_GUARD);
+    marking->Step(i::MB, i::IncrementalMarking::NO_GC_VIA_STACK_GUARD,
+                  i::IncrementalMarking::FORCE_COMPLETION);
     if (marking->IsReadyToOverApproximateWeakClosure()) {
       marking->FinalizeIncrementally();
     }