Revert my patch in r191155 to allow forward
class/protocol decls in @implementation and
fixup modern rewriter to handle that.
// rdar://15066233


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191311 91177308-0d34-0410-b5e6-96231b3b80d8
clang-cl: pass /nologo when falling back to cl.exe

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191316 91177308-0d34-0410-b5e6-96231b3b80d8