Support VTune's JIT interface.

runtime/vm/vtune.h

Index: runtime/vm/vtune.h
diff --git a/runtime/vm/vtune.h b/runtime/vm/vtune.h
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+// 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.
+
+#ifndef VM_VTUNE_H_
+#define VM_VTUNE_H_
+
+#include "vm/allocation.h"
+
+namespace dart {
+
+class VTune : public AllStatic {
+ public:
+  // Returns true if this process is being sampled by VTune.
+  static bool IsActive();
+
+  // Registers given memory region as a method with the given name.
+  static void Register(const char* name, uword base, uword size);
+};
+
+}  // namespace dart
+
+#endif  // VM_VTUNE_H_