[5.0-12-12-2018] Cherry pick recent migrator changes #21715
migrator: run try? migration pass only when migrating from swift<5.
6bb8a293
migrator: rename index(of:) to firstIndex(of:) for swift 5.
f911506d
migrator: set up placeholder migration scripts for swift 4.2
1a6c0603
migrator: rename a property declaration if the framework property it …
1c6fe153
akyrtzi
approved these changes
on 2019-01-08
akyrtzi
merged
407ce676
into swift-5.0-branch-12-12-2018 6 years ago
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