[clang] [llvm] Clang: Add nsz to llvm.minnum and llvm.maxnum emitted from fmin and fmax (PR #113133)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> Do you have any data on the impact of the change?

This change in isolation shouldn't change anything. In the absence of changing the minnum definition to have strict zero handling, adding nsz is a no-op. With strict signed zero handling, this would help avoid regressions in the lowering 

https://github.com/llvm/llvm-project/pull/113133