Rather than storing the relations between free-regions in a global
table, introduce a `FreeRegionMap` data structure. regionck computes the `FreeRegionMap` for each fn and stores the result into the tcx so that borrowck can use it (this could perhaps be refactored to have borrowck recompute the map, but it's a bid tedious to recompute due to the interaction of closures and free fns). The main reason to do this is because of #22779 -- using a global table was incorrect because when validating impl method signatures, we want to use the free region relationships from the *trait*, not the impl. Fixes #22779.
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