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r300: Fix omod failing to increase the number of channels stored.

Emma Anholt requested to merge anholt/mesa:r300-fixes into main 
In dEQP-GLES2.functional.shaders.operator.geometric.reflect.highp_vec2_fragment
and friends this pass would turn:

  0: DP3 temp[1].x, input[1].yx0_, input[0].wy0_;
  1: MUL temp[2].xy, temp[1].xx__, const[0].xx__;

into

  0: DP3 temp[2].x * 2, input[1].yx0_, input[0].wy0_;
  1: MUL temp[3].xy, temp[2].xy__, input[1].yx__;

Note the attempt to use .y of temp[2].  Just bail when we more dst
channels than src channels, since the rewrite can't generate more channels
for us.  Fixes this subset of tests (which I hadn't included in the xfails
until now since results hadn't quite been stable).

Cc: mesa-stable

Also the uif fix that replaces !12954 (closed)

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