Pavel Yaskevich 059a3602f8 [CSBindings] Refactor a check to produce follow-up direct supertype bindings ...

This is a follow-up to https://github.com/apple/swift/pull/30113
which cased a regression because it was placed under a check which
allows direct supertypes to be inferred if previous (failing) binding
has a supertype as well which has nothing to do with collection
inference.

Let's combine supertype check and inference logic to avoid such
confusion in the future.

Resolves: rdar://problem/60501780

2020-03-16 12:17:55 -07:00

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