swift234

Provide the '@escaping' fix-it for any call-site escaping mismatch. (#4181)

...not just those where the functions match otherwise. This allows the
fix-it to be provided in cases where the closure being passed is a
subtype, or when there are generics involved. Yes, the '@escaping'
might not be the only issue, but it will need to get fixed, and
probably independently of anything else that's going on (except
perhaps calling the wrong function).

rdar://problem/27729540
(cherry picked from commit 148e25dc03f8f6ceabd15603e19e0adf09dcc4e9)