[clang] [Cygwin] Cygwin basic support (PR #76943)

[Anton Korobeynikov via cfe-commits]

=?utf-8?b?5b6Q5oyB5oGS?= Xu Chiheng,=?utf-8?b?5b6Q5oyB5oGS?= Xu Chiheng
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In-Reply-To: <llvm.org/llvm/llvm-project/pull/76943 at github.com>


https://github.com/asl requested changes to this pull request.

This lacks tests and some references how TLS is implemented on Cygwin

https://github.com/llvm/llvm-project/pull/76943