swift

0b4a483f - Merge pull request #16722 from jrose-apple/mutableCopy-is-not-a-word (#16732)

Merge pull request #16722 from jrose-apple/mutableCopy-is-not-a-word (#16732) [SIL] Make sure @objc thunks for 'mutableCopy' are treated as +1 rdar://problem/40373771 (cherry picked from commit 23fc4f4d3eedf820be059f04429fe41998c505af)