Jordan Rose f1902fd719 [Serialization] Drop typealiases whose underlying types have changed. (#8896) ...

In order to accomplish this, cross-module references to typealiases
are now banned except from within conformances and NameAliasTypes, the
latter of which records the canonical type to determine if the
typealias has changed. For conformances, we don't have a good way to
check if the typealias has changed without trying to map it into
context, but that's all right---the rest of the compiler can already
fall back to the canonical type.

2017-04-21 13:17:12 -07:00

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