For 14.9 driver version, AMD changed their mind again (a bug is back).

At least, they stopped to print hundreds of unrolled loop messages.

* Tested the same way the previous merge was.
* Performance is the same (well, a few more c/s).
* For a large GWS (60k) , even my 3 years old board has no call running for more than 140ms.

```
All tests passed without error.  Performed 5 tests.  Time used was 188 seconds    
```