Doug Gregor 67c81154af Add a swift3_migration attribute to describe how an API gets migrated. ...

Introduce a new attribute, swift3_migration, that lets us describe the
transformation required to map a Swift 2.x API into its Swift 3
equivalent. The only transformation understood now is "renamed" (to
some other declaration name), but there's a message field where we can
record information about other changes. The attribute can grow
somewhat (e.g., to represent parameter reordering) as we need it.

Right now, we do nothing but store and validate this attribute.

2016-01-13 16:53:01 -08:00

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