Create compiler-scheduler subdir and move existing scheduler there

src/compiler-dispatcher/optimizing-compile-dispatcher.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef V8_OPTIMIZING_COMPILE_DISPATCHER_H_
-#define V8_OPTIMIZING_COMPILE_DISPATCHER_H_
+#ifndef V8_COMPILER_DISPATCHER_OPTIMIZING_COMPILE_DISPATCHER_H_
+#define V8_COMPILER_DISPATCHER_OPTIMIZING_COMPILE_DISPATCHER_H_
 
 #include <queue>
 
 #include "src/base/atomicops.h"
 #include "src/base/platform/condition-variable.h"
 #include "src/base/platform/mutex.h"
 #include "src/base/platform/platform.h"
 #include "src/flags.h"
 #include "src/list.h"
 
@@ skipping 75 matching lines @@
   // Copy of FLAG_concurrent_recompilation_delay that will be used from the
   // background thread.
   //
   // Since flags might get modified while the background thread is running, it
   // is not safe to access them directly.
   int recompilation_delay_;
 };
 }  // namespace internal
 }  // namespace v8
 
-#endif  // V8_OPTIMIZING_COMPILE_DISPATCHER_H_
+#endif  // V8_COMPILER_DISPATCHER_OPTIMIZING_COMPILE_DISPATCHER_H_