vc4, v3d, freedreno: nir lowering helpers
Makes use of the new helpers to hopefully reduce the work @jekstrand needs to do in the NIR metadata series. vc4 tested, v3d nearly so, freedreno still to do.
Makes use of the new helpers to hopefully reduce the work @jekstrand needs to do in the NIR metadata series. vc4 tested, v3d nearly so, freedreno still to do.