sandbox: move Codegen into bpf_dsl directory

sandbox/linux/bpf_dsl/codegen.h

 // Copyright (c) 2012 The Chromium 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 SANDBOX_LINUX_SECCOMP_BPF_CODEGEN_H__
-#define SANDBOX_LINUX_SECCOMP_BPF_CODEGEN_H__
+#ifndef SANDBOX_LINUX_BPF_DSL_CODEGEN_H__
+#define SANDBOX_LINUX_BPF_DSL_CODEGEN_H__
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <map>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/tuple.h"
 #include "sandbox/sandbox_export.h"
@@ skipping 96 matching lines @@
   // if it's an unconditional jump to a node semantically-equivalent to N.
   std::vector<Node> equivalent_;
 
   std::map<MemoKey, Node, MemoKeyLess> memos_;
 
   DISALLOW_COPY_AND_ASSIGN(CodeGen);
 };
 
 }  // namespace sandbox
 
-#endif  // SANDBOX_LINUX_SECCOMP_BPF_CODEGEN_H__
+#endif  // SANDBOX_LINUX_BPF_DSL_CODEGEN_H__