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

[Andrzej Warzyński via cfe-commits]

banach-space wrote:

> @banach-space The remaining failures appear unrelated to this PR: the same tests also fail in https://github.com/llvm/llvm-project/actions/runs/36557266864/job/109369316377 for an unrelated PR.

The post-commit is also failing: https://lab.llvm.org/buildbot/#/workers/229 (I am about to look into it). 

Btw, do you have commit access?

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