glsl-1.10: extend glsl-vs-copy-propagation-1 test
r300 backend DCE optimizes incorrectly out the b = color.z statement however the loop needs at least two iters before this leads to failure. So run it once more with two iters.
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r300 backend DCE optimizes incorrectly out the b = color.z statement however the loop needs at least two iters before this leads to failure. So run it once more with two iters.