Rework r187192, to tweak expressions to be tolerant of DOSish paths. XFAILs can be removed.
Rework r187192, to tweak expressions to be tolerant of DOSish paths. XFAILs can be removed.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@187194 91177308-0d34-0410-b5e6-96231b3b80d8

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