nir: add a couple of ior opts to nir_opt_algebraic

One of these was seen in a Deus Ex shader.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

src/compiler/nir/nir_opt_algebraic.py

@@ -285,6 +285,9 @@ optimizations = [
    (('iand', ('uge(is_used_once)', a, b), ('uge', a, c)), ('uge', a, ('umax', b, c))),
    (('iand', ('uge(is_used_once)', a, c), ('uge', b, c)), ('uge', ('umin', a, b), c)),
 
+   (('ior', 'a@bool', ('ieq', a, False)), True),
+   (('ior', 'a@bool', ('inot', a)), True),
+
    (('iand', ('ieq', 'a@32', 0), ('ieq', 'b@32', 0)), ('ieq', ('ior', 'a@32', 'b@32'), 0)),
 
    # These patterns can result when (a < b || a < c) => (a < min(b, c))