intel/brw: Report number of GRF registers used in brw_stage_prog_data.

This is similar to what we used to do on pre-SNB platforms, the number
of GRF registers used by the shader will be used on Xe3+ to adjust the
trade-off between thread-level parallelism and size of the GRF file.
Plumb the value through prog_data so the driver can set up the
hardware state accordingly.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32664>

src/intel/compiler/brw_compile_tcs.cpp

@@ -287,6 +287,7 @@ brw_compile_tcs(const struct brw_compiler *compiler,
 
    assert(v.payload().num_regs % reg_unit(devinfo) == 0);
    prog_data->base.base.dispatch_grf_start_reg = v.payload().num_regs / reg_unit(devinfo);
+   prog_data->base.base.grf_used = v.grf_used;
 
    brw_generator g(compiler, &params->base,
                   &prog_data->base.base, MESA_SHADER_TESS_CTRL);