Restore test from r211844 skipping '.file' directives
Restore test from r211844 skipping '.file' directives

At least this answers the question of whether .bc/.ll input processed by the
frontend produces identical output to the original compilation.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@211853 91177308-0d34-0410-b5e6-96231b3b80d8

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