PR #17305 [4.2-06-11] Cherry-pick migrator changes

[4.2-06-11] Cherry-pick migrator changes #17305

nkcsgexi merged 2 commits into swiftlang:swift-4.2-branch-06-11-2018 from nkcsgexi:cherry-pick-06-18

swift-api-digester: emit the diff items for changing from RawRepresen…

b455ada2

migrator: handle the reversion of raw representable changes. rdar://3…

b0a51880

nkcsgexi merged 4625b5af into swift-4.2-branch-06-11-2018 8 years ago

nkcsgexi deleted the cherry-pick-06-18 branch 8 years ago

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