[clang] [libc] [Clang] Implement resource directory headers for common GPU intrinsics (PR #110179)

[Johannes Doerfert via cfe-commits]

https://github.com/jdoerfert commented:

I left many minor comments but nothing blocking.

@jhuber6  Were there any conceptual concerns in the thread?

https://github.com/llvm/llvm-project/pull/110179