[analyzer] [tests] Write to logfile instead of stdout while updating
[analyzer] [tests] Write to logfile instead of stdout while updating

reference results

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@326295 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 4c51d85a8954184fd2ff922e8b3ddd23aeb04ae0)

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