r300: simplify KILL transformation
We had some special cases before when we could actually get some IFs on r300 with VDPAU. Now that VDPAU is gone and everything goes through ntt, we don't have to worry anymore. Remove the complicated logic and just always transform KILL into KIL none.-1
No shader-db change on RV530 or RV370.
Signed-off-by: Pavel Ondračka pavel.ondracka@gmail.com