Reland "[heap] Provide ObjectMarking with marking transitions"

src/objects-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.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 2103 matching lines @@
          this == GetHeap()->empty_weak_cell());
   WRITE_FIELD(this, kValueOffset, Smi::kZero);
 }
 
 
 void WeakCell::initialize(HeapObject* val) {
   WRITE_FIELD(this, kValueOffset, val);
   // We just have to execute the generational barrier here because we never
   // mark through a weak cell and collect evacuation candidates when we process
   // all weak cells.
-  WriteBarrierMode mode = Marking::IsBlack(ObjectMarking::MarkBitFrom(this))
+  WriteBarrierMode mode = ObjectMarking::IsBlack(this)
                               ? UPDATE_WRITE_BARRIER
                               : UPDATE_WEAK_WRITE_BARRIER;
   CONDITIONAL_WRITE_BARRIER(GetHeap(), this, kValueOffset, val, mode);
 }
 
 bool WeakCell::cleared() const { return value() == Smi::kZero; }
 
 Object* WeakCell::next() const { return READ_FIELD(this, kNextOffset); }
 
 
@@ skipping 6284 matching lines @@
 #undef WRITE_INT64_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_INL_H_