Switch UnreachableObjectsFilter to use Marking instead of InstrusiveMarking.

src/spaces-inl.h

Index: src/spaces-inl.h
diff --git a/src/spaces-inl.h b/src/spaces-inl.h
index 1973b3a3500504119ea8ea6d07d36b4c844880ae..bb505b29f291e1ebbec671276296ff1df0259250 100644
--- a/src/spaces-inl.h
+++ b/src/spaces-inl.h
@@ -348,7 +348,7 @@ void NewSpace::ShrinkStringAtAllocationBoundary(String* string, int length) {
   allocation_info_.top =
       string->address() + StringType::SizeFor(length);
   string->set_length(length);
-  if (Marking::IsBlack(Marking::MarkBitFrom(string))) {
+  if (MarkCompactCollector::IsLiveBytesUpdateRequired(string)) {
     int delta = static_cast<int>(old_top - allocation_info_.top);
     MemoryChunk::IncrementLiveBytes(string->address(), -delta);
   }