Work around PR29097 to get the module bots going again. This replaces an =default constructor with an explicit definition.
Work around PR29097 to get the module bots going again.
This replaces an =default constructor with an explicit definition.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@279522 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 20885de16a00606f4fbbf36d78421f93acd4b337)

apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm