mesa: clear shader_info::is_lowered in prog_to_nir
This needs to be resetted each time prog_to_nir is called because it turns st_nir_assign_vs_in_locations into a no-op when set. Fixes: 81d106d6 ("radeonsi: lower IO intrinsics - complete rewrite of input/output scanning") Closes: #5001 Reviewed-by:Isaac Bosompem <mrisaacb@google.com> Reviewed-by:
Marek Olšák <marek.olsak@amd.com> Part-of: <!11636>