pan/bi: Add bi_layout.c for clause layout helpers

Figuring out what "shapes" of clauses are kosher happens during
scheduling, not packing, but shouldn't distract the scheduler. So let's
add a new file for these sorts of questions.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5260>
4 files changed