nir: add unsigned comparison simplifications

This avoids loop unrolling regressions in Wolfenstein II on DXVK
with an upcoming optimisation series from Samuel.
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

src/compiler/nir/nir_opt_algebraic.py

@@ -149,7 +149,9 @@ optimizations = [
    (('~inot', ('feq', a, b)), ('fne', a, b)),
    (('~inot', ('fne', a, b)), ('feq', a, b)),
    (('inot', ('ilt', a, b)), ('ige', a, b)),
+   (('inot', ('ult', a, b)), ('uge', a, b)),
    (('inot', ('ige', a, b)), ('ilt', a, b)),
+   (('inot', ('uge', a, b)), ('ult', a, b)),
    (('inot', ('ieq', a, b)), ('ine', a, b)),
    (('inot', ('ine', a, b)), ('ieq', a, b)),