Kill CK_Unknown references in the ObjC rewriter.  The actual choice of cast doesn't matter here, but I've tried to choose the right one anyway.
Kill CK_Unknown references in the ObjC rewriter.  The actual
choice of cast doesn't matter here, but I've tried to choose
the right one anyway.



git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@119140 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang