[PATCH 0/4] A couple of EXA migration optimization patches.

[Michel Dänzer]

Please review these for inclusion in xserver master.

[PATCH 1/4] EXA: Don't use UTS/DFS directly for Put/GetImage when there's a system copy.
[PATCH 2/4] EXA: Use relevant source region to minimize migration on CopyWindow fallbacks.
[PATCH 3/4] EXA: Limit src prepareAccess regions for a number of unaccelerated operations.
[PATCH 4/4] EXA: Restrict the regions that need to be migrated for composite fallback for src / mask pictures.