[committed] amdgcn: use unsigned extend for lshiftrt

[Andrew Stubbs]

This patch fixes a bug in which 8 and 16-bit vector shifts used the 
wrong kind of extend, thus causing wrong results.  It was simply a 
thinko in the insn code, so easily fixed.

Andrew


P.S. Apologies for the "work-in-progress" tag on the commit subject. 
Obviously that was meant to be removed, but I didn't notice it until 
after the push. :-(
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