brw: avoid calling lower_indirect_derefs multiple times

Lowering the indirect derefs multiple times leads to very inefficient
shaders because of all the control flow inserted.

In particular on some DGC tests with mesh shaders, the tests can spin
for 1hour on an i7 and still not complete compilation.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33809>

src/intel/compiler/brw_nir.c

@@ -1432,17 +1432,6 @@ brw_nir_link_shaders(const struct brw_compiler *compiler,
       NIR_PASS(_, producer, nir_lower_global_vars_to_local);
       NIR_PASS(_, consumer, nir_lower_global_vars_to_local);
 
-      /* The backend might not be able to handle indirects on
-       * temporaries so we need to lower indirects on any of the
-       * varyings we have demoted here.
-       */
-      NIR_PASS(_, producer, nir_lower_indirect_derefs,
-                  brw_nir_no_indirect_mask(compiler, producer->info.stage),
-                  UINT32_MAX);
-      NIR_PASS(_, consumer, nir_lower_indirect_derefs,
-                  brw_nir_no_indirect_mask(compiler, consumer->info.stage),
-                  UINT32_MAX);
-
       brw_nir_optimize(producer, devinfo);
       brw_nir_optimize(consumer, devinfo);