I can confirm this bug with radeonsi with various Unity-based games. With
attachment 88452 [details] [review] applied everything works.

Stack:
GPU: "PITCAIRN" (ChipID = 0x6819)
Linux: 3.11.6
libdrm: 2.4.47
LLVM: SVN:trunk/r193475
libclc: Git:master/4c18120c1a
Mesa: Git:master/fa8b1514d3
GLAMOR: Git:master/ba209eeef2
DDX: Git:master/f1dc677e79