[clang] [CIR][AArch64] Handle constrained Neon FMA and sqrt (PR #218307)

[Andrzej Warzyński via cfe-commits]

banach-space wrote:

I am still unable to land this:

<img width="906" height="487" alt="Screenshot 2026-10-05 at 10 54 11" src="https://github.com/user-attachments/assets/c31c46de-903d-4c4f-b8cb-936fca63523a" />

Please squash the commits and rebase on top of `main` - perhaps that will help.

https://github.com/llvm/llvm-project/pull/218307