[clang] [clang][CIR] Add lowering for Neon rounding builtins (PR #195021)

[Andrzej Warzyński via cfe-commits]

banach-space wrote:

> Regarding the remaining 15 new tests in neon/intrinsics.c: the original neon-intrinsics.c had zero f32 standard rounding tests (vrnd_f32, vrnda_f32). The new file adds them for the first time.

Great, thank you so much for adding those! Now, could you also document this non-obvious change in the summary? Something along the following lines would be great:

> Prior to this patch, tests for the following builtins were missing:
>   * item 1
>   * item 2
>   * etc
>
> For this reasons, #num-of-new-tests > #num-of-deleted-tests.

Thank you!

https://github.com/llvm/llvm-project/pull/195021