[clang] [Clang] Refactor the tests to be more uniform (PR #191944)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> @AaronBallman The triple didn't need to be changed, I'll change it back.

Oh! Thank you, that made the changes so much more clear to me. :-) I think the changes LG, but I'll leave it to codegen folks for the final sign-off.

https://github.com/llvm/llvm-project/pull/191944