This is not really a bug as normal user will never encounter this, just some
nuisance I discovered when I tried to investigate bug 60552 a little bit.

When RADEON_NO_TCL=1 is used (which is useful in diagnosing compiler bugs), the
whole machine sometimes hardlocks. App from bug 60552 is a good way to
reproduce this.

This debug option should be either fixed, or if it no longer considered useful,
then it should be removed. 

BTW this was working not a year ago, so I can probably run a bisect if needed.