VM: Re-format to use at most one newline between functions

runtime/platform/allocation.h

 // Copyright (c) 2017, 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 RUNTIME_PLATFORM_ALLOCATION_H_
 #define RUNTIME_PLATFORM_ALLOCATION_H_
 
 #include "platform/assert.h"
 
 namespace dart {
 
 // Stack allocated objects subclass from this base class. Objects of this type
 // cannot be allocated on either the C or object heaps. Destructors for objects
 // of this type will not be run unless the stack is unwound through normal
 // program control flow.
 class ValueObject {
  public:
   ValueObject() {}
   ~ValueObject() {}
 
  private:
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(ValueObject);
 };
 
-
 // Static allocated classes only contain static members and can never
 // be instantiated in the heap or on the stack.
 class AllStatic {
  private:
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(AllStatic);
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_PLATFORM_ALLOCATION_H_