nir/algebraic: add distributive rules for ior/iand

Totals from 581 (0.43% of 134368) affected shaders (Polaris):
CodeSize: 1389560 -> 1386488 (-0.22%)
Instrs: 264488 -> 263984 (-0.19%)
Cycles: 1057952 -> 1055936 (-0.19%)
VMEM: 296016 -> 291613 (-1.49%)

Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4830>

src/compiler/nir/nir_opt_algebraic.py

@@ -121,6 +121,8 @@ optimizations = [
    (('usadd_4x8', a, ~0), ~0),
    (('~fadd', ('fmul', a, b), ('fmul', a, c)), ('fmul', a, ('fadd', b, c))),
    (('iadd', ('imul', a, b), ('imul', a, c)), ('imul', a, ('iadd', b, c))),
+   (('iand', ('ior', a, b), ('ior', a, c)), ('ior', a, ('iand', b, c))),
+   (('ior', ('iand', a, b), ('iand', a, c)), ('iand', a, ('ior', b, c))),
    (('~fadd', ('fneg', a), a), 0.0),
    (('iadd', ('ineg', a), a), 0),
    (('iadd', ('ineg', a), ('iadd', a, b)), b),