[arcmt] Don't try to handle files that are already ARC'ified, this is not possible currently.

rdar://14461559

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@190880 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index c1bac55..3dde81c 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -2563,7 +2563,7 @@
   Args.AddLastArg(CmdArgs, options::OPT_working_directory);
 
   bool ARCMTEnabled = false;
-  if (!Args.hasArg(options::OPT_fno_objc_arc)) {
+  if (!Args.hasArg(options::OPT_fno_objc_arc, options::OPT_fobjc_arc)) {
     if (const Arg *A = Args.getLastArg(options::OPT_ccc_arcmt_check,
                                        options::OPT_ccc_arcmt_modify,
                                        options::OPT_ccc_arcmt_migrate)) {