Replace C++ bitfields with our own BitFields

src/heap-snapshot-generator-inl.h

 // Copyright 2013 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_SNAPSHOT_GENERATOR_INL_H_
 #define V8_HEAP_SNAPSHOT_GENERATOR_INL_H_
 
 #include "src/heap-snapshot-generator.h"
 
 namespace v8 {
 namespace internal {
 
 
 HeapEntry* HeapGraphEdge::from() const {
-  return &snapshot()->entries()[from_index_];
+  return &snapshot()->entries()[from_index()];
 }
 
 
 HeapSnapshot* HeapGraphEdge::snapshot() const {
   return to_entry_->snapshot();
 }
 
 
 int HeapEntry::index() const {
   return static_cast<int>(this - &snapshot_->entries().first());
@@ skipping 13 matching lines @@
   SLOW_DCHECK(children_index_ < snapshot_->children().length() ||
       (children_index_ == snapshot_->children().length() &&
        children_count_ == 0));
   return &snapshot_->children().first() + children_index_;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_SNAPSHOT_GENERATOR_INL_H_