These are tests that fail in the next commit without this flag. This
does not add -verify-ignore-unrelated to all tests with -verify, only
the ones that would fail without it. This is NFC since this flag is
currently a no-op.
@objc inference was looking at unavailable requirements---for which we
don't ever record witnesses---at a point when it is no longer possible
to record such a witness. This is a targeted fix; we need to tackle
the issue of unavailable and optional requirements more thoroughly.
Fixes SR-3917 / rdar://problem/30474860.
