Doug Gregor 6dbde269b8 [AST] Collapse redundant specialized conformances. ...

Sometimes we end up mapping a conformance into and then out of a
particular context, which led to "stacked" specialized conformances
that were basically a no-op. Look through these to collapse them
eagerly.

Collapses 15786 conformances in the standard library.

2017-11-20 14:08:55 -08:00

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