[clang] [llvm] [llvm-ar][Archive] Use getDefaultTargetTriple instead of host triple for the fallback archive format. (PR #82888)

[James Henderson via cfe-commits]

https://github.com/jh7370 commented:

I think the new behaviour makes more sense to me than the old one, thanks, but I think it should be documented both in the release notes and the llvm-ar Command Guide document.

https://github.com/llvm/llvm-project/pull/82888