Mark Lacey 85237aa071 [ConstraintSystem] Allow getPotentialBindings to find supertypes of optionals. ...

Improve enumerateDirectSupertypes so that for T? it will return U? if
U is a supertype of T. This is another form of direct supertype.

This is making up for a deficiency in the completeness of our Type
join implementation, which should be able to directly compute a join
of disparate types that share some common supertype, but sometimes
fails to in cases involving protocol compositions.

Fixes rdar://problem/45490737

2018-10-23 21:56:38 -07:00

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