convert BitVector to use pointer size blocks

src/data-flow.cc

-// Copyright 2010 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.
-
-#include "src/data-flow.h"
-
-#include "src/base/bits.h"
-#include "src/scopes.h"
-
-namespace v8 {
-namespace internal {
-
-#ifdef DEBUG
-void BitVector::Print() {
-  bool first = true;
-  PrintF("{");
-  for (int i = 0; i < length(); i++) {
-    if (Contains(i)) {
-      if (!first) PrintF(",");
-      first = false;
-      PrintF("%d", i);
-    }
-  }
-  PrintF("}");
-}
-#endif
-
-
-void BitVector::Iterator::Advance() {
-  current_++;
-  uint32_t val = current_value_;
-  while (val == 0) {
-    current_index_++;
-    if (Done()) return;
-    val = target_->data_[current_index_];
-    current_ = current_index_ << 5;
-  }
-  val = SkipZeroBytes(val);
-  val = SkipZeroBits(val);
-  current_value_ = val >> 1;
-}
-
-
-int BitVector::Count() const {
-  int count = 0;
-  for (int i = 0; i < data_length_; i++) {
-    int data = data_[i];
-    if (data != 0) count += base::bits::CountPopulation32(data);
-  }
-  return count;
-}
-
-}  // namespace internal
-}  // namespace v8