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

[Peter Waller via cfe-commits]

peterwaller-arm wrote:

I've checked the buildkite failures are in cfi-standalone-lld-thinlto-x86_64, which I believe are unrelated to this change.

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