RegAllocGreedy: Add dummy priority advisor for writing MIR tests (#121207) I regularly struggle reproducing failures in greedy due to changes in priority when resuming the allocation from MIR vs. a complete compilation starting at IR. That is, the fix in e0919b189bf2df4f97f22ba40260ab5153988b14 did not really fix the problem of the instruction distance mattering. Add a way to bypass all of the priority heuristics for MIR tests, by prioritizing only by virtual register number. Could also give this a more specific name, like PrioritizeLowVirtRegNumber
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