Slava Pestov 112d1bd561 SILOptimizer: Small cleanups for devirtualizer ...

Where possible, pass around a ClassDecl or a CanType instead of a
SILType that might wrap a metatype; the unwrapping logic was
repeated in several places.

Also add a FIXME for a bug I found by inspection.

2019-02-28 22:40:54 -05:00

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