intel/compiler: Create and use struct for Bindless thread payload

Reviewed-by: Marcin Ślusarz <marcin.slusarz@intel.com>
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

@@ -154,6 +154,15 @@ struct task_mesh_thread_payload : public thread_payload {
    fs_reg task_urb_input;
 };
 
+struct bs_thread_payload : public thread_payload {
+   bs_thread_payload();
+
+   fs_reg global_arg_ptr;
+   fs_reg local_arg_ptr;
+
+   void load_shader_type(const brw::fs_builder &bld, fs_reg &dest) const;
+};
+
 /**
  * The fragment shader front-end.
  *
@@ -493,6 +502,11 @@ public:
       return *static_cast<task_mesh_thread_payload *>(this->payload_);
    }
 
+   bs_thread_payload &bs_payload() {
+      assert(stage >= MESA_SHADER_RAYGEN && stage <= MESA_SHADER_CALLABLE);
+      return *static_cast<bs_thread_payload *>(this->payload_);
+   }
+
    bool source_depth_to_render_target;
    bool runtime_check_aads_emit;