[llvm] [AArch64] Add sanitazation when custom lowering fp partial reduce (PR #184811)

[David Green via llvm-commits]

https://github.com/davemgreen commented:

You need to rebase over the clmul test updates, but this isn't necessary. The reason to add it seems to be a misunderstanding of how strict fp works.

https://github.com/llvm/llvm-project/pull/184811