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lima: ppir: codegen: fix combine instruction dest_modifier

Erico Nunes requested to merge enunes/mesa-lima:lima-18.3-ppir-dest-modifier into lima-18.3 
Without this fix, ppir codegen outputs instructions that always write to
the x component of the output register, so a simple shader like this
won't work:
  gl_FragColor = vec4(color.rg, sqrt(color.b*color.b), color.a);
It produces
  sqrt.s2 $0.x  $1.x
instead of
  sqrt.s2 $0.z  $1.x

Signed-off-by: Erico Nunes <nunes.erico@gmail.com>

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