Doug Gregor f9c34756ef Parameterize conformance lookup on whether "missing" conformances are allowed. ...

Many clients of the conformance lookup operations would prefer to get
an invalid conformance (== there is no conformance) rather than a
missing conformance. Parameterize the conformance lookup operations so
that most callers won't see missing conformances, by filtering them
out at the end. Opt-in those callers that do want to see missing
conformances so they can be diagnosed.

2021-08-03 00:10:45 -07:00

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