Add option to gen_snapshot for creating a Makefile describing a snapshot's dependencies.

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_