pan/bi: Introduce segments into the IR

Needed to select between global, UBO, TLS, and WLS addressing modes,
required to implement loads/stores correctly.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6749>
4 files changed