R600: Add BFE DAG combines

[Jan Vesely]

On Fri, 2014-04-25 at 13:57 -0700, Matt Arsenault wrote:
> These patches allow some simplifications of BFE nodes. I just noticed the instruction patterns aren’t actually trying to match the BFE pattern, but that can be fixed later
> 
I tried these on top of my patches, but did not see any change in the asm output

regards,
-- 
Jan Vesely <jan.vesely at rutgers.edu>
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