Doug Gregor 66b11cbc3d [SE-0160] Make deprecated @objc inference warnings opt-in. ...

The warnings about deprecated @objc inference in Swift 3 mode can be a
bit annoying; and are mostly relevant to the migration workflow. Make
the warning emission a three-state switch:

* None (the default): don't warn about these issues.
* Minimal (-warn-swift3-objc-inference-minimal): warn about direct
  uses of @objc entrypoints and provide "@objc" Fix-Its for them.
* Complete (-warn-swift3-objc-inference-complete): warn about all
  cases where Swift 3 infers @objc but Swift 4 will not.

Fixes rdar://problem/31922278.

2017-05-01 16:25:50 -07:00

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