Propagating prior merge from 'llvm.org/release_50'.
Propagating prior merge from 'llvm.org/release_50'.

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