intel/compiler: Store Patch URB output in TCS thread payload struct

Acked-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Marcin Ślusarz <marcin.slusarz@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Acked-by: Ian Romanick <ian.d.romanick@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18176>

src/intel/compiler/brw_fs.h

@@ -95,6 +95,8 @@ struct thread_payload {
 
 struct tcs_thread_payload : public thread_payload {
    tcs_thread_payload(const fs_visitor &v);
+
+   fs_reg patch_urb_output;
 };
 
 struct fs_thread_payload : public thread_payload {