Dispose of the diagnostics in clang-refactor-test
Dispose of the diagnostics in clang-refactor-test

414251c9711ba8fa6781f2f899d855a9579b91d5 forgot that.

(cherry picked from commit 6b59623ebe1dd854c9828b43ad3bb03d03e76bf9)

apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang