nir: handle mul24 in nir_def_bits_used

Reviewed-by: Georg Lehmann <dadschoorse@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34489>

src/compiler/nir/nir_range_analysis.c

@@ -2263,6 +2263,11 @@ ssa_def_bits_used(const nir_def *def, int recur)
                return all_bits;
             }
 
+         case nir_op_imul24:
+         case nir_op_umul24:
+            bits_used |= all_bits & 0xffffff;
+            break;
+
          default:
             /* We don't know what this op does */
             return all_bits;