Ben Barham fd7d59daa6 [CursorInfo] Add a synthesized field ...

Mark implicit declarations with a `synthesized` field, since while we
still want them to have a cursor info result (eg. for their USR to find
possible overrides), it's likely that clients will want to treat them
differently to results that have a real location in source.

An alternative could be to remove the location entirely, but:
  - the module name would also have to be removed to prevent wasted
    lookups in the generated interface
  - having the location could still be useful as the location that
    caused the synthesized declaration (though at the moment only
    synthesized initializers have a location)

Resolves rdar://84990655

2021-11-05 15:52:10 +10:00

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