[Constraint solver] Don't bail out early when we have equivalent type variables.
[Constraint solver] Don't bail out early when we have equivalent type variables.

Found by inspection; a misplaced 'break' meant that, if we encountered
a relational constraint where both sides are type variables that are
equivalent, we would stop looking for more type bindings, which could
lead us to miss obvious type inferences. While I wasn't able to
construct a case where this changed the behavior of type inference,
this *does* happen, and the previous code was clearly wrong.

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