The TGL render compression modifiers and part of the media compression modifier in iris.
This MR relies on other MRs in flight. I've cherry-picked the smallest number of commits needed for building this MR at the beginning of sections 1 and 2. Once the commits in the other MRs have landed upstream, I'll drop them from this MR and be able to land the dependent sections.
Some commits in this MR will block other MRs, so I may land parts of it to keep things moving forward.
Bugfixes can be found at the beginning of sections 1-3 (but after the cherry-picks).
I plan to squash the "squash!" commits once they're reviewed.
The modifier patches haven't been retested with the latest kernel patches on the list: