[C++] clang HEAD 9.0.0 (https://github.com/llvm-mirror/clang.git 176c1186cd8ed4d2893c07c97a9f57560ce45019) (https://github.com/llvm-mirror/llvm.git c30eca2a728d6c9b1ac09833dc8e0e8f0039c536)