Make using '-fshort-enums' an error until it is actually implemented (changes the ABI, so it is dangerous to not error out if we don't support it).  Fixes <rdar://problem/7461006>.

llvm-svn: 91191
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 724a3b4..1d82d82 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -798,7 +798,8 @@
   Arg *Unsupported;
   if ((Unsupported = Args.getLastArg(options::OPT_MG)) ||
       (Unsupported = Args.getLastArg(options::OPT_MQ)) ||
-      (Unsupported = Args.getLastArg(options::OPT_iframework)))
+      (Unsupported = Args.getLastArg(options::OPT_iframework)) ||
+      (Unsupported = Args.getLastArg(options::OPT_fshort_enums)))
     D.Diag(clang::diag::err_drv_clang_unsupported)
       << Unsupported->getOption().getName();