[Bug 84662] Long pauses with Unreal demo Elemental on R9270X since : Always flush the HDP cache before submitting a CS to the GPU

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Comment # 34 on bug 84662 from Luzipher

As todays commit 7b4276d7acf2e0f77044cb50caa6ad936fa78786, "r600g,radeonsi:
Always use GTT again for PIPE_USAGE_STREAM buffers", refers to this bug:
The patch helps tremendously against stuttering (~0.5s pause irregularly about
twice a minute) in Borderlands 2. Kernel is an unmodified agd5f 3.18-next,
hardware r9 290x.

Thanks !

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