[clang] [llvm] [AArch64] Make user-visible Arm architecture version strings consistent (PR #98550)

[Tomas Matheson via llvm-commits]

tmatheson-arm wrote:

> Seems like there are still many more inconsistencies that could be improved too.

To be clear, I'm not suggesting you need to do them in this PR.

https://github.com/llvm/llvm-project/pull/98550