Make header include guards great again

runtime/vm/branch_optimizer.h

 // Copyright (c) 2016, 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_BRANCH_OPTIMIZER_H_
-#define VM_BRANCH_OPTIMIZER_H_
+#ifndef RUNTIME_VM_BRANCH_OPTIMIZER_H_
+#define RUNTIME_VM_BRANCH_OPTIMIZER_H_
 
 #include "vm/allocation.h"
 
 namespace dart {
 
 class FlowGraph;
 class JoinEntryInstr;
 class Zone;
 class TargetEntryInstr;
 class Value;
@@ skipping 29 matching lines @@
 // Rewrite diamond control flow patterns that materialize values to use more
 // efficient branchless code patterns if such are supported on the current
 // platform.
 class IfConverter : public AllStatic {
  public:
   static void Simplify(FlowGraph* flow_graph);
 };
 
 }  // namespace dart
 
-#endif  // VM_BRANCH_OPTIMIZER_H_
+#endif  // RUNTIME_VM_BRANCH_OPTIMIZER_H_