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isl: Pick a better initial state for zeroed MCS

Nanley Chery requested to merge nchery/mesa:perf-fix/iris-mcs-init-zeroed into main

What does this MR do and why?

isl: Pick a better initial state for zeroed MCS

Pick the compressed-no-clear aux state instead of aux-invalid state to
reduce ambiguates in iris. Hopefully this will help debug the issues
seen around MCS-enabling on ACM.

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