[llvm] [AArch64][GISEL] Consider fcmp true and fcmp false in cond code selection (PR #86972)

[Marc Auberer via llvm-commits]

marcauberer wrote:

@arsenm How is the procedure for such crash fixes. I am unsure, because this is my first one. Do we need to downport this to release/18.x?

https://github.com/llvm/llvm-project/pull/86972