ibc: CSE across blocks
Use the same algorithms as NIR.
Will fix https://gitlab.freedesktop.org/jekstrand/mesa/issues/42 and fix half of https://gitlab.freedesktop.org/jekstrand/mesa/issues/43.
Use the same algorithms as NIR.
Will fix https://gitlab.freedesktop.org/jekstrand/mesa/issues/42 and fix half of https://gitlab.freedesktop.org/jekstrand/mesa/issues/43.