[llvm] [clang] [ARM] Introduce the v9.5-A architecture version to Arm targets (PR #78994)

[David Spickett via cfe-commits]

DavidSpickett wrote:

> No, V9.5-A is v9-only. The v9.4-A version was the last one to have a matching v8.x.

Cool. If you can find where we encode that mapping, it's worth adding a comment to say explicitly that the relation stops at 9.5.

https://github.com/llvm/llvm-project/pull/78994