[llvm] [AMDGPU][GISel] Fold 'min(min(x,y),z)' and 'max(max(x,y),z)' into min3 and max3 (PR #200410)

[Petar Avramovic via llvm-commits]

https://github.com/petar-avramovic edited https://github.com/llvm/llvm-project/pull/200410