[heap] Add regression test for chromium:598319

src/heap/incremental-marking.cc

Index: src/heap/incremental-marking.cc
diff --git a/src/heap/incremental-marking.cc b/src/heap/incremental-marking.cc
index 26b1c5d58f52353951ae7ff64efbf1bcd8ca9b95..0f45c7a02e1846a2e7d231354bafbc516ee15780 100644
--- a/src/heap/incremental-marking.cc
+++ b/src/heap/incremental-marking.cc
@@ -279,7 +279,7 @@ void IncrementalMarking::IterateBlackObject(HeapObject* object) {
   if (IsMarking() && Marking::IsBlack(Marking::MarkBitFrom(object))) {
     Page* page = Page::FromAddress(object->address());
     if ((page->owner() != nullptr) && (page->owner()->identity() == LO_SPACE)) {
-      // IterateBlackObject requires us to visit the hole object.
+      // IterateBlackObject requires us to visit the whole object.
       page->ResetProgressBar();
     }
     IncrementalMarkingMarkingVisitor::IterateBody(object->map(), object);