Last cleanup int -> intptr_t. Also removed a hack.

runtime/vm/bitmap.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/bitmap.h"
 
 #include "platform/assert.h"
 #include "vm/object.h"
 
 namespace dart {
@@ skipping 72 matching lines @@
   ASSERT(data_ != NULL);
   return ((data_[byte_offset] & mask) != 0);
 }
 
 
 void BitmapBuilder::SetBit(intptr_t bit_offset, bool value) {
   if (!InRange(bit_offset)) {
     FATAL1("Fatal error in BitmapBuilder::SetBit :"
            " invalid bit_offset, %" Pd "\n", bit_offset);
   }
-  int byte_offset = bit_offset >> kBitsPerByteLog2;
+  intptr_t byte_offset = bit_offset >> kBitsPerByteLog2;
   ASSERT(byte_offset < data_size_in_bytes_);
-  int bit_remainder = bit_offset & (kBitsPerByte - 1);
+  intptr_t bit_remainder = bit_offset & (kBitsPerByte - 1);
   uint8_t mask = 1U << bit_remainder;
   ASSERT(data_ != NULL);
   if (value) {
     data_[byte_offset] |= mask;
   } else {
     data_[byte_offset] &= ~mask;
   }
 }
 
 }  // namespace dart