After further experimenting, I discovered a sort-of fix.
Here's what I did (this worked for me but you may be able to get away with 
fewer steps):
1. Disable visual effects.
2. Enable visual effects using proprietary FLGRX driver and restart.
3. Disable FLGRX but keep on using visual effects (with FOSS driver).

Now I don't get shadow corruption after a suspend.

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compiz corruption upon resume
https://bugs.launchpad.net/bugs/219353
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