Revert of [heap] delete Heap::LeftTrimFixedAray

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 "src/base/bits.h"
 #include "src/heap/spaces.h"
 
@@ skipping 65 matching lines @@
   INLINE(static void MarkWhite(MarkBit mark_bit)) {
     mark_bit.Clear();
     mark_bit.Next().Clear();
   }
 
   INLINE(static void BlackToWhite(MarkBit markbit)) {
     DCHECK(IsBlack(markbit));
     markbit.Clear();
   }
 
+  INLINE(static void GreyToWhite(MarkBit markbit)) {
+    DCHECK(IsGrey(markbit));
+    markbit.Clear();
+    markbit.Next().Clear();
+  }
+
   INLINE(static void BlackToGrey(MarkBit markbit)) {
     DCHECK(IsBlack(markbit));
     markbit.Next().Set();
   }
 
   INLINE(static void WhiteToGrey(MarkBit markbit)) {
     DCHECK(IsWhite(markbit));
     markbit.Set();
     markbit.Next().Set();
   }
@@ skipping 10 matching lines @@
 
   INLINE(static void BlackToGrey(HeapObject* obj)) {
     BlackToGrey(MarkBitFrom(obj));
   }
 
   INLINE(static void AnyToGrey(MarkBit markbit)) {
     markbit.Set();
     markbit.Next().Set();
   }
 
+  static void TransferMark(Heap* heap, Address old_start, Address new_start);
+
 #ifdef DEBUG
   enum ObjectColor {
     BLACK_OBJECT,
     WHITE_OBJECT,
     GREY_OBJECT,
     IMPOSSIBLE_COLOR
   };
 
   static const char* ColorName(ObjectColor color) {
     switch (color) {
@@ skipping 732 matching lines @@
  private:
   MarkCompactCollector* collector_;
 };
 
 
 const char* AllocationSpaceName(AllocationSpace space);
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_MARK_COMPACT_H_