R600: Some fixes

[Vincent Lejeune]

Hi,

another couple of fixes for R600.

The first one remove the VPM bit in export instructions. While I didn't see any change when this bit is set or cleared, the doc recommand to left it cleared
as SB does.
The second one fixes a rather rare bug that was uncovered by vs-varying-mat3-wr piglit test.
The last one is from the last serie and is improved following Tom's comments.

Vincent
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