[llvm] [SDAG] Fix fmaximum legalization errors (PR #142170)

[Benjamin Kramer via llvm-commits]

d0k wrote:

I think this is wrong for fminimum. We check that LHS is not equal integer 0, but we need to check that it's exactly -0.0 or it might pick a random value in LHS. e.g. `fmin(-1.0, 0.0)`

https://github.com/llvm/llvm-project/pull/142170