PATCH: R600/SI: Instruction verifier improvements

[Tom Stellard]

Hi,

The attached patches add some more checks to the instruction verifier on SI
and also fix some false positives.  This should fix all the verifier errors
generated by the piglit tests.

As far as I can tell, there are no regressions with this series.  I had some trouble
making it through a full run on my Boanire system without hangs, so I would feel better
if someone else was able to test these.

-Tom
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