[heap] Make non-atomic markbit operations consistent with atomic ones.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 89bc3a75621826262fefeded4328011ba95b22e6..7933327c588a44b3abd0a05f19e6095200958265 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -4287,7 +4287,7 @@ void Heap::RegisterReservationsForBlackAllocation(Reservation* reservations) {
 void Heap::NotifyObjectLayoutChange(HeapObject* object,
                                     const DisallowHeapAllocation&) {
   if (FLAG_incremental_marking && incremental_marking()->IsMarking()) {
-    incremental_marking()->MarkGrey(object);
+    incremental_marking()->WhiteToGreyAndPush(object);
   }
 #ifdef VERIFY_HEAP
   DCHECK(pending_layout_change_object_ == nullptr);
@@ -4852,7 +4852,7 @@ class IterateAndScavengePromotedObjectsVisitor final : public ObjectVisitor {
     // promoted objects.
     if (heap_->incremental_marking()->black_allocation()) {
       Code* code = Code::cast(Code::GetObjectFromEntryAddress(code_entry_slot));
-      heap_->incremental_marking()->MarkGrey(code);
+      heap_->incremental_marking()->WhiteToGreyAndPush(code);
     }
   }
 
@@ -4891,7 +4891,7 @@ void Heap::IterateAndScavengePromotedObject(HeapObject* target, int size,
   // regular visiting and IteratePromotedObjectPointers.
   if (!was_marked_black) {
     if (incremental_marking()->black_allocation()) {
-      incremental_marking()->MarkGrey(target->map());
+      incremental_marking()->WhiteToGreyAndPush(target->map());
       incremental_marking()->IterateBlackObject(target);
     }
   }
@@ -5655,7 +5655,7 @@ void Heap::RegisterExternallyReferencedObject(Object** object) {
   HeapObject* heap_object = HeapObject::cast(*object);
   DCHECK(Contains(heap_object));
   if (FLAG_incremental_marking_wrappers && incremental_marking()->IsMarking()) {
-    incremental_marking()->MarkGrey(heap_object);
+    incremental_marking()->WhiteToGreyAndPush(heap_object);
   } else {
     DCHECK(mark_compact_collector()->in_use());
     mark_compact_collector()->MarkObject(heap_object);