default diag::err_pp_file_not_found to mapping to fatal, implementing PR3492: #include failures should be a fatal error
default diag::err_pp_file_not_found to mapping to fatal,
implementing PR3492: #include failures should be a fatal error


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@63915 91177308-0d34-0410-b5e6-96231b3b80d8

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