[llvm] [NFC][ARM] Split SIMD identifier away from MVE (PR #130296)

[David Green via llvm-commits]

https://github.com/davemgreen commented:

It looks like there is a failing test. This sounds OK so long as you have tested it to make sure it doesn't alter anything unexpected. SIMD is really a generic term for any vectorization, ASIMD (Advanced SIMD) is the architectural name for Neon. It looks like for gcc +simd only implies +neon though, it can't be used for +mve too.

https://github.com/llvm/llvm-project/pull/130296