Remove support for splitting word-wrapped diagnostic messages on newline characters. I could find no newline character in a diagnostic message, and adding an assert to this code never fires in the testsuite.
Remove support for splitting word-wrapped diagnostic messages on newline
characters. I could find no newline character in a diagnostic message,
and adding an assert to this code never fires in the testsuite.

I think this code is essentially dead, and was previously used for
a different purpose. If I just don't understand how it is we can end up
with a newline here please let me know (with a test case?) and I'll
revert.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@140497 91177308-0d34-0410-b5e6-96231b3b80d8

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