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intel: Implement and enable MCS ambiguates

Nanley Chery requested to merge nchery/mesa:mcs-ambiguate into main

There are several benefits to doing this, but probably the two most important are:

  • More complete handling of WA 14013111325 for anv (!8755 (merged)).
  • Removal of a blocker towards enabling MCS_CCS in small-BAR mode for iris.

This includes a fix for a flaky test failure that happens when MCS partial resolves are enabled more often on BDW/iris (#4179 (closed)). It may help avoid a GPU hang I saw on BDW when putting this MR in the CI, but I haven't been able to reproduce the hang to confirm it. I'm including the fix here just in case.

/cc @sagarghuge, @jljusten, @kwg

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