[clang] [ARM][Driver] Ensure NEON is enabled and disabled correctly (PR #137595)

[via cfe-commits]

https://github.com/sivan-shani commented:

Testing the enablement of `neon` when: `(HasAES || HasSHA2 || HasBF16 || HasDotprod || HasI8MM)`
It might be a good idea to add a direct test for one/some of those condition directly.
Currently there are only indirect tests in `clang/test/Driver/arm-features.c` when crypto is on which enable `aes` and `sha2` which in turn enable `neon`

https://github.com/llvm/llvm-project/pull/137595