[clang] [clang][Driver] Support simplified triple versions for config files (PR #111387)

[Carlo Cabrera via cfe-commits]

carlocab wrote:

Merging this to land the improvement. Happy to work on suggested improvements for the tests if any are still outstanding from the discussion in https://github.com/llvm/llvm-project/pull/111387#discussion_r1873784293 (since it's not clear to me which comments still apply). CC @MaskRay 

https://github.com/llvm/llvm-project/pull/111387