Doug Gregor a9a8defe10 [Serialization] Make serialization of witnesses deterministic. ...

Serialization of the requirement-to-synthetic-environment map was
walking in DenseMap order. However, the keys to this map are
known---they're always the generic parameters of the requirement. So,
walk those generic parameters to make it deterministic, and don't
bother serializing them because they're known to the deserializer
already.

Fixes rdar://problem/29689811.

2016-12-16 10:35:43 -08:00

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