fn find_determining_place<'tcx>(
switch_place: Place<'tcx>,
block: &BasicBlockData<'tcx>
) -> Option<Place<'tcx>>Expand description
Finds a unique place that entirely determines the value
of switch_place, if it exists. This is only a heuristic.
Ideally we would like to track multiple determining places
for some edge cases, but one is enough for a lot of situations.