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9a3907c97f
The previous formulation of this predicate caused a CP in snapshots where a variable had a large number of definitions and also reached a large number of sub-basic-blocks. This should fix performance of https://github.com/FrodeSolheim/fs-uae and https://github.com/libretro/libretro-uae. The `FlowVar.getAnAccess` predicate is still at risk of CP'ing when a large group of defs has a large group of uses, but that has not been observed to happen in practice yet. We would need to make `localFlowStep` expose phi definitions in order to avoid that risk.