Doug Gregor feb0f702b6 [Mangling] Fix mangling of nested generic typealiases. ...

The mangling of generic typealiases was using the underlying type’s generic
arguments rather than the generic arguments for the typealias itself.
Directly encode the generic arguments from the substitution map instead.

Also address some related issues with remangling generic typealiases.

Fixes rdar://problem/41444286.

2018-06-26 13:48:13 -07:00

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