nir: fix progress reporting in nir_io_add_const_offset_to_base

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Marek Olšák <maraeo@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35069>

src/compiler/nir/nir_io_add_const_offset_to_base.c

@@ -107,10 +107,12 @@ add_const_offset_to_base_block(nir_block *block, nir_builder *b,
                sem.location += off;
                b->cursor = nir_before_instr(&intrin->instr);
                nir_src_rewrite(offset, nir_imm_int(b, 0));
-               progress = true;
             }
             /* non-indirect indexing should reduce num_slots */
             sem.num_slots = is_dual_slot(intrin) ? 2 : 1;
+
+            nir_io_semantics original = nir_intrinsic_io_semantics(intrin);
+            progress |= memcmp(&original, &sem, sizeof(sem));
             nir_intrinsic_set_io_semantics(intrin, sem);
          }
       }