swift

3dc7a2de - Sema: Fix substMemberTypeWithBase() for non-generic typealias with 'where' clause

Sema: Fix substMemberTypeWithBase() for non-generic typealias with 'where' clause getContextSubstitutionMap() builds a substitution map for the generic signature of the parent context, which is wrong if the typealias has its own 'where' clause.