Doug Gregor f4135f963d [Conformance lookup table] Prefer synthesized conformances to deserialized ones. ...

When a conformance can either be synthesized or implied, we tend to prefer
implied. However, if the implied conformance comes from a deserialized
conformance, it will lead to an incomplete conformance and cause a crash.

This is a narrow fix for SR-6105 / rdar://problem/34911378.

2017-10-16 15:35:11 -07:00

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