nir/algebraic: optimize iand/ior of (n)eq zero

nir/algebraic: optimize iand/ior of (n)eq zero

Found in some Detroit: Become Human shaders.

Totals from affected shaders:
SGPRS: 700256 -> 700256 (0.00 %)
VGPRS: 507208 -> 507212 (0.00 %)
Spilled SGPRs: 142531 -> 142531 (0.00 %)
Spilled VGPRs: 0 -> 0 (0.00 %)
Private memory VGPRs: 0 -> 0 (0.00 %)
Scratch size: 0 -> 0 (0.00 %) dwords per thread
Code Size: 76404616 -> 76301768 (-0.13 %) bytes
LDS: 43 -> 43 (0.00 %) blocks
Max Waves: 21438 -> 21438 (0.00 %)

Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
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>