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intel/compiler: Remove more users of the MRF hack

Kenneth Graunke requested to merge kwg/mesa:brw-less-mrf-hack into main

There are only three users of the "MRF hack" remaining in the FS backend:

  1. emit_dummy_fs(), for overriding the FS output to /* Everyone's favorite color */. Nobody uses this.
  2. The repclear shader for fast clears and medium-speed clears.
  3. Spilling messages on Gen7-8.

This patch series eliminates the first two, giving us a bit of incremental progress toward eliminating this ugly hack. It doesn't address the third yet.

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