[ConstraintSystem] Delay adding contextual requirements until parent … #23652
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…type is opened
openUnboundGenericType
eagerly tries to add conditional requirementsassociated with chain of parents of the given type if type has been
declared inside of constrained extension. But one of the parent types
might be unbound e.g.
A.B
which means it has to be opened, whichby itself, would add such requirements.
Resolves: rdar://problem/49371608