Doug Gregor 97c6707910 [SubstitutionMap] Cope with missing conformances in lookupConformance(). ...

When asking a substitution map for a conformance, it's okay if the
conformance isn't there---just detect this case and return None.

Also, collapse a redundant testcase Huon noted.

2017-04-04 10:58:01 -07:00

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