MarkBit cleanup: They have to be accessed through Marking accessors.

src/heap/objects-visiting-inl.h

Index: src/heap/objects-visiting-inl.h
diff --git a/src/heap/objects-visiting-inl.h b/src/heap/objects-visiting-inl.h
index 872b2dd30c814da322199aa643ad5fe17cbceee2..9065f7dbfbe9696716cf86e6b42ff223d6ff40bd 100644
--- a/src/heap/objects-visiting-inl.h
+++ b/src/heap/objects-visiting-inl.h
@@ -684,7 +684,7 @@ bool StaticMarkingVisitor<StaticVisitor>::IsFlushable(Heap* heap,
   // Code is either on stack, in compilation cache or referenced
   // by optimized version of function.
   MarkBit code_mark = Marking::MarkBitFrom(function->code());
-  if (code_mark.Get()) {
+  if (Marking::IsMarked(code_mark)) {
     return false;
   }
 
@@ -713,7 +713,7 @@ bool StaticMarkingVisitor<StaticVisitor>::IsFlushable(
   // Code is either on stack, in compilation cache or referenced
   // by optimized version of function.
   MarkBit code_mark = Marking::MarkBitFrom(shared_info->code());
-  if (code_mark.Get()) {
+  if (Marking::IsMarked(code_mark)) {
     return false;
   }