[heap] Fix page promotions tests

src/heap/mark-compact.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_HEAP_MARK_COMPACT_H_
 #define V8_HEAP_MARK_COMPACT_H_
 
 #include <deque>
 
 #include "src/base/bits.h"
@@ skipping 405 matching lines @@
 class MinorMarkCompactCollector {
  public:
   explicit MinorMarkCompactCollector(Heap* heap)
       : heap_(heap), marking_deque_(heap) {}
 
   void SetUp();
   void TearDown();
 
   void CollectGarbage();
 
+  inline Heap* heap() const { return heap_; }
+
  private:
   class RootMarkingVisitor;
 
-  inline Heap* heap() { return heap_; }
   inline Isolate* isolate() { return heap()->isolate(); }
   inline MarkingDeque* marking_deque() { return &marking_deque_; }
 
   V8_INLINE void MarkObject(HeapObject* obj);
   V8_INLINE void PushBlack(HeapObject* obj);
 
   SlotCallbackResult CheckAndMarkObject(Heap* heap, Address slot_address);
   void MarkLiveObjects();
   void ProcessMarkingDeque();
   void EmptyMarkingDeque();
@@ skipping 420 matching lines @@
 
  private:
   MarkCompactCollector* collector_;
 };
 
 V8_EXPORT_PRIVATE const char* AllocationSpaceName(AllocationSpace space);
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_MARK_COMPACT_H_