Amazingly they've fixed my UXA crash problems that I've had since december with the latest release, going on 32 hours now with no crashes with mesa 7.6 and the latest drm/-intel.
you can remove these, first two are for EXA and last one is impled automatically because there's only uxa now.
Not a good idea IMO unless you absolutely need the fix..
Option "EXAOptimizeMigration" "true"
Option "MigrationHeuristic" "greedy"
Option "AccelMethod" "uxa"
Option "MigrationHeuristic" "greedy"
Option "AccelMethod" "uxa"
Option "Tiling" "false" # may break 3D rendering if enabled
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