zink: run nir_opt_algebraic_late

This pass is needed to finish off the [ui]2imp lowering. Follow what
other drivers do and perform some dead-code elimimation etc when
lowering happens.

Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10101>

src/gallium/drivers/zink/zink_compiler.c

@@ -444,6 +444,16 @@ optimize_nir(struct nir_shader *s)
       NIR_PASS(progress, s, nir_opt_undef);
       NIR_PASS(progress, s, zink_nir_lower_b2b);
    } while (progress);
+
+   do {
+      progress = false;
+      NIR_PASS(progress, s, nir_opt_algebraic_late);
+      if (progress) {
+         NIR_PASS_V(s, nir_copy_prop);
+         NIR_PASS_V(s, nir_opt_dce);
+         NIR_PASS_V(s, nir_opt_cse);
+      }
+   } while (progress);
 }
 
 /* check for a genuine gl_PointSize output vs one from nir_lower_point_size_mov */