pan/bi: Remove nontrivial SPECIAL ops

These require a lot more handholding in the IR than we can deal with at
this stage; we need to restrict ourselves to frcp/sqrt.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4470>
3 files changed