swift

c89e2ac9 - Merge pull request #16641 from nathawes/rdar40225476-segfault-migrating-type-inside-function-type-argument-4.2-04-30-2018

Merge pull request #16641 from nathawes/rdar40225476-segfault-migrating-type-inside-function-type-argument-4.2-04-30-2018 [4.2 04/30][migrator] Treat the top-level argument parens of function types as an index level in the ChildIndexFinder