Change COMPILE_ASSERT to take only one argument and use it in more places.

runtime/vm/ring_buffer.h

 // Copyright (c) 2014, 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.
 
 #ifndef VM_RING_BUFFER_H_
 #define VM_RING_BUFFER_H_
 
 #include "platform/assert.h"
 #include "platform/utils.h"
 
@@ skipping 13 matching lines @@
   const T& Get(int i) const {
     ASSERT(0 <= i && i < Size());
     return data_[(count_ - i - 1) & kMask];
   }
 
   // Returns the number of elements currently stored in this buffer (at most N).
   int Size() const { return Utils::Minimum(count_, static_cast<int64_t>(N)); }
 
  private:
   static const int kMask = N - 1;
-  COMPILE_ASSERT((N & kMask) == 0, N_must_be_power_of_two);
+  COMPILE_ASSERT((N & kMask) == 0);
   T data_[N];
   int64_t count_;
 };
 
 }  // namespace dart
 
 #endif  // VM_RING_BUFFER_H_