1c4b64f016
TGSI doesn't have a DEMOTE_IF, so we want to lower it back to IF DEMOTE ENDIF. Fixes a regression with nvc0 on nir-to-tgsi. Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15932>