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

[Joseph Huber via cfe-commits]

jhuber6 wrote:

I am wondering if it would be easier to provide generic builtins in clang and just codegen them. I guess in that case we'd just upscale everything to 64-bit and say "If you need the other one use the target specific version".

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