[clang] [Clang][Driver][AArch64] Add support for aarch64-amazon-linux triple (PR #109263)

[Peter Waller via cfe-commits]

peterwaller-arm wrote:

OK, Thanks for the input all. I'm abandoning this change, I'm not following up for the time being if someone is able to fix this.

Part of the problem is that it's not clear what a clean/correct cmake check would be to determine the triple. My current thinking is that cmake could take the existing inferred triple from config.guess and then amend the vendor. What's unclear is how to determine the vendor in an accurate and scalable way, without making a mess. Perhaps it would be even better if someone can fix config.guess since that is used by other projects, and then LLVM would not need special logic and it keeps the detection logic in one place.

https://github.com/llvm/llvm-project/pull/109263