[heap] Give marking functions for incremental marking more precise names.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 4ee1a177e59a848d265d9f1e9502276af9a8f7ec..d6a83346fab226b70ba9816222077bf99b14ffd9 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -4696,7 +4696,7 @@ class IteratePromotedObjectsVisitor final : public ObjectVisitor {
     // promoted objects.
     if (heap_->incremental_marking()->black_allocation()) {
       Code* code = Code::cast(Code::GetObjectFromEntryAddress(code_entry_slot));
-      IncrementalMarking::MarkObject(heap_, code);
+      IncrementalMarking::MarkGrey(heap_, code);
     }
   }
 
@@ -4732,7 +4732,7 @@ void Heap::IteratePromotedObject(HeapObject* target, int size,
   // regular visiting and IteratePromotedObjectPointers.
   if (!was_marked_black) {
     if (incremental_marking()->black_allocation()) {
-      IncrementalMarking::MarkObject(this, target->map());
+      IncrementalMarking::MarkGrey(this, target->map());
       incremental_marking()->IterateBlackObject(target);
     }
   }