[clang] clang: Add builtin header for amdhsa abi (PR #181993)

[Joseph Huber via cfe-commits]

https://github.com/jhuber6 approved this pull request.

I still think that the address space specifier should go after the type, as that's where it's supposed to go. The old attributes are very permissive, the new ones will either warn or do nothing with the current placement. But it's not a functional issue.

https://github.com/llvm/llvm-project/pull/181993