Make header include guards great again

runtime/vm/cpuid.h

Index: runtime/vm/cpuid.h
diff --git a/runtime/vm/cpuid.h b/runtime/vm/cpuid.h
index b33812e5e1a398b0e4cdd7443c44ae5cb0429c54..63b317b919a31a2236e57bb551cea85dabcdd9a9 100644
--- a/runtime/vm/cpuid.h
+++ b/runtime/vm/cpuid.h
@@ -2,8 +2,8 @@
 // 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_CPUID_H_
-#define VM_CPUID_H_
+#ifndef RUNTIME_VM_CPUID_H_
+#define RUNTIME_VM_CPUID_H_
 
 #include "vm/globals.h"
 #if !defined(TARGET_OS_MACOS)
@@ -45,4 +45,4 @@ class CpuId : public AllStatic {
 }  // namespace dart
 
 #endif  // !defined(TARGET_OS_MACOS)
-#endif  // VM_CPUID_H_
+#endif  // RUNTIME_VM_CPUID_H_