Doug Gregor 4f8edeb913 [Runtime] Always fail to find a conditional conformance at runtime. ...

Proper evaluation of conditional conformances at runtime (e.g., as part of
dynamic casting) is too large to tackle in the Swift 4.1 timeframe. For now,
record that a conformance is conditional in the protocol conformance record,
and always return "does not conform" to such types.

Fixes rdar://problem/35761301.

2017-12-04 16:51:52 -08:00

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