Remove auto_ptr in C++17. Get it back by defining _LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR

llvm-svn: 292986
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: e67179bc6c7ca93370409eab5359f3adf337e4cd
19 files changed