Fix build break.

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 {
 
 bool BitmapBuilder::Get(intptr_t bit_offset) const {
   if (!InRange(bit_offset)) {
     return false;
   }
   return GetBit(bit_offset);
 }
 
 
 void BitmapBuilder::Set(intptr_t bit_offset, bool value) {
   while (!InRange(bit_offset)) {
     intptr_t new_size = size_in_bytes_ + kIncrementSizeInBytes;
-    ASSERT(new_size > size_in_bytes_);
+    ASSERT(new_size > 0);
     uint8_t* new_bit_list = reinterpret_cast<uint8_t*>(
         Isolate::Current()->current_zone()->Allocate(new_size));
     ASSERT(new_bit_list != NULL);
     ASSERT(bit_list_ != NULL);
     uint8_t* old_bit_list = bit_list_;
     memmove(new_bit_list, old_bit_list, size_in_bytes_);
     memset((new_bit_list + size_in_bytes_), 0, kIncrementSizeInBytes);
     size_in_bytes_ = new_size;
     bit_list_ = new_bit_list;
   }
@@ skipping 66 matching lines @@
   ASSERT(bit_list_ != NULL);
   byte_addr = &(bit_list_[byte_offset]);
   if (value) {
     *byte_addr |= mask;
   } else {
     *byte_addr &= ~mask;
   }
 }
 
 }  // namespace dart