Doug Gregor 3042e1f5ed [Serialization] Deserialize type witnesses before value witnesses. ...

The deserialization of the type witnesses for a normal protocol conformance
is crucial to the usability of said conformance. Deserializing the
value witnesses first can fail if they somehow rely on the type
witnesses (e.g., through a recursive conformance).

As a stop-gap, deserialize and record type witnesses *first*, then
deserialize value witnesses afterward. A longer-term solution would
make deserialization of the normal protocol conformance far more
lazy.

Fixes SR-6522 / rdar://problem/35830641, a merge-modules crasher in a
nontrivial project.

2017-12-14 22:07:23 -08:00

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