[clang] [lldb] Enable aarch64-amazon-linux triple (PR #82231)

[Sébastien Stormacq via cfe-commits]

https://github.com/sebsto created https://github.com/llvm/llvm-project/pull/82231

Add aarch64-amazon-linux triplet to allow compilation for Amazon Linux 2023 on Graviton CPU

This should address https://github.com/apple/llvm-project/issues/8227

Also submitted to downstream `apple/llvm-project` 
https://github.com/apple/llvm-project/pull/8228


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