I'm nominating merging "Teach BaseIndexOffset to correctly handle with indexed operations" for the 6.0.0 branch. This is a straightforward bugfix in SelectionDAG's address analysis which was triggered by a post-split commit in trunk.
Looking at the r322085 thread, it sounds like there are still problems in this area. But maybe r322003 still makes sense to merge? Please let me know.
It's still worth merging; the case that r322003 fixes is should be reachable without it.
Merged in r322693.