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

[Paul Walker via llvm-commits]

paulwalker-arm wrote:

> The reason to add it seems to be a misunderstanding of how strict fp works.

It is paranoia based on customer engagements, not a misunderstanding of how strict fp works.



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