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

src/heap/objects-visiting-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_OBJECTS_VISITING_INL_H_
 #define V8_OBJECTS_VISITING_INL_H_
 
 
 namespace v8 {
 namespace internal {
@@ skipping 662 matching lines @@
 
 
 template <typename StaticVisitor>
 bool StaticMarkingVisitor<StaticVisitor>::IsFlushable(Heap* heap,
                                                       JSFunction* function) {
   SharedFunctionInfo* shared_info = function->shared();
 
   // 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::IsBlackOrGrey(code_mark)) {
     return false;
   }
 
   // The function must have a valid context and not be a builtin.
   if (!IsValidNonBuiltinContext(function->context())) {
     return false;
   }
 
   // We do not (yet) flush code for optimized functions.
   if (function->code() != shared_info->code()) {
     return false;
   }
 
   // Check age of optimized code.
   if (FLAG_age_code && !function->code()->IsOld()) {
     return false;
   }
 
   return IsFlushable(heap, shared_info);
 }
 
 
 template <typename StaticVisitor>
 bool StaticMarkingVisitor<StaticVisitor>::IsFlushable(
     Heap* heap, SharedFunctionInfo* shared_info) {
   // 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::IsBlackOrGrey(code_mark)) {
     return false;
   }
 
   // The function must be compiled and have the source code available,
   // to be able to recompile it in case we need the function again.
   if (!(shared_info->is_compiled() && HasSourceCode(heap, shared_info))) {
     return false;
   }
 
   // We never flush code for API functions.
@@ skipping 171 matching lines @@
 
   RelocIterator it(this, mode_mask);
   for (; !it.done(); it.next()) {
     it.rinfo()->template Visit<StaticVisitor>(heap);
   }
 }
 }
 }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_VISITING_INL_H_