intel/compiler: Use FS thread payload only for FS

Move the setup into the FS thread payload constructor.  Consolidate
payload setup for that in brw_fs_thread_payload.cpp file.

Reviewed-by: Francisco Jerez <currojerez@riseup.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18176>

src/intel/compiler/brw_lower_logical_sends.cpp

@@ -2681,7 +2681,7 @@ fs_visitor::lower_logical_sends()
          lower_fb_write_logical_send(ibld, inst,
                                      brw_wm_prog_data(prog_data),
                                      (const brw_wm_prog_key *)key,
-                                     payload);
+                                     fs_payload());
          break;
 
       case FS_OPCODE_FB_READ_LOGICAL: