PR #16672 [4.2-04-30] Cherry-pick migrator changes

[4.2-04-30] Cherry-pick migrator changes #16672

nkcsgexi merged 4 commits into swiftlang:swift-4.2-branch-04-30-2018 from nkcsgexi:cherry-migrator-05-16-04-30

swift-api-digester: add an action to dump USRs for all decls in a hea…

907e4325

swift-api-digester: detect API changes due to undoing NS_TYPED_EXTENS…

51d407a0

swift-api-digester: print raw type names for raw representable API ch…

98627783

migrator: use raw type names from migration scripts instead of hard-c…

6bc889e5

nkcsgexi merged 26c70a55 into swift-4.2-branch-04-30-2018 8 years ago

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