[clang] [CIR][AArch64] Lower vfma lane builtins (PR #188190)

[Yair Ben Avraham via cfe-commits]

yairbenavraham wrote:

> Thanks! I have a high-level ask - could you split this PR into multiple PRs?
> 
> Basically, this is implementing quite a few variants in one PR:
> 
>     * `BI__builtin_neon_vfmaq_v`
> 
>     * `BI__builtin_neon_vfmaq_lane_v`
> 
>     * `BI__builtin_neon_vfma_laneq_v`
> 
>     * `BI__builtin_neon_vfmaq_laneq_v`
> 
>     * `BI__builtin_neon_vfmad_laneq_f64`
> 
> 
> The implementations are different, some tests are missing (e.g. for `BI__builtin_neon_vfmaq_v`) and the output generated _with_ and _without_ `-fclangir` do not match. This will require taking a closer look, hence kind request to split this. Could you start with `BI__builtin_neon_vfmaq_v`?
> 
> Thanks for working on this! I am leaving more comments inline.

https://github.com/llvm/llvm-project/pull/195602

https://github.com/llvm/llvm-project/pull/188190