Pavel Yaskevich e021691bae [ConstraintGraph] Fix contractEdges to gather constraints only once ...

Currently we have this non-optimal behavior in `contractEdges` where
for every type variable it gathers constraints for its whole equivalence
class before checking if any are "contractable", instead constraints
could be gathered/filtered once which removes a lot of useless work.

2018-05-11 16:08:53 -07:00

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