Slava Pestov 6548ad709b Sema: Remove TR_NonEnumInheritanceClauseOuterLayer ...

This was added at some point with the associated type where
clause work, but it appears to be unnecessary, because all
the tests passed with this removed.

It also introduced a source compatibility issue where we
stopped accepting typealiases to protocol compositions in
protocol inheritance clauses.

Add a test for this case too, since it wasn't tested before.

Fixes <https://bugs.swift.org/browse/SR-4855>.

2017-05-10 22:12:25 -07:00

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