[llvm] Intrinsic: introduce minimumnum and maximumnum for IR and SelectionDAG (PR #96649)

[YunQiang Su via llvm-commits]

wzssyqa wrote:

> Why is APFloat in this patch?

To make the CI happy.  I will rebase it once https://github.com/llvm/llvm-project/pull/96304 is merged.

https://github.com/llvm/llvm-project/pull/96649