[C++] clang HEAD 9.0.0 (https://github.com/llvm-mirror/clang.git 7f5aa78ec0f83af1444a63d5f38dc099aaa7279a) (https://github.com/llvm-mirror/llvm.git c7cadf83fffba81e2663deb3c0587d08b5a68c9f)