Make header include guards great again

runtime/vm/cpu_arm.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_CPU_ARM_H_
-#define VM_CPU_ARM_H_
+#ifndef RUNTIME_VM_CPU_ARM_H_
+#define RUNTIME_VM_CPU_ARM_H_
 
 #include "vm/allocation.h"
 #include "vm/simulator.h"
 
 namespace dart {
 
 // TargetCPUFeatures gives CPU features for the architecture that we are
 // generating code for. HostCPUFeatures gives the CPU features for the
 // architecture that we are actually running on. When the architectures
 // are the same, TargetCPUFeatures will query HostCPUFeatures. When they are
@@ skipping 105 matching lines @@
   static ARMVersion arm_version() {
     return HostCPUFeatures::arm_version();
   }
   static intptr_t store_pc_read_offset() {
     return HostCPUFeatures::store_pc_read_offset();
   }
 };
 
 }  // namespace dart
 
-#endif  // VM_CPU_ARM_H_
+#endif  // RUNTIME_VM_CPU_ARM_H_