[clang] [CLANG][AArch64]Add Neon vectors for fpm8_t (PR #99865)

[Paul Walker via cfe-commits]

paulwalker-arm wrote:

Sorry for the noise but I think I've a more wellformed question this time.

Is it be possible to use `AArch64SVEACLETypes.def` to reduce some of the boilerplate changes?  I'm not sure how much of this is tied to SVE (or rather scalable types) but I'm wondering if clang can be refactored to use `AARCH64_TYPE` for the places where the types do not matter (e.g. when populating enums) and only use `SVE_TYPE` for the places that care about the scalable property.

No is a fine answer but when looking at the code I'd rather not have to repeat all these changes for every new AArch64 scalar type we might want in the future.

https://github.com/llvm/llvm-project/pull/99865