[patch] Make r600 non-experimental

Tue May 21 11:01:20 PDT 2013

The r600 backend has been in tree for some time now. It has tests that
are being maintained and there is even a buildbot that builds it.

We should probably stop calling it experimental. This should make sure
that we don't accidentally break the build.

Is the attached patch OK?

Cheers,
Rafael
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