Slava Pestov 3ab5b6fa19 IRGen/Runtime: Remove parent field from type metadata ...

We no longer need this for anything, so remove it from metadata
altogether. This simplifies logic for emitting type metadata and
makes type metadata smaller.

We still pass the parent metadata pointer to type constructors;
removing that is a separate change.

2017-09-25 15:45:17 -07:00

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