Address review comment on r189557.
Address review comment on r189557.

We need to escape filenames the same way in InclusionRewriter whether
UseLineDirective is true or false.

Review comment from http://llvm.org/bugs/show_bug.cgi?id=17018#c2

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@190834 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/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,apple/swift-clang,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