use errs() instead of cerr.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@79829 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/Backend.cpp b/lib/Frontend/Backend.cpp
index 650e213..964b470 100644
--- a/lib/Frontend/Backend.cpp
+++ b/lib/Frontend/Backend.cpp
@@ -328,7 +328,7 @@
   std::string Error;
   if (!AddEmitPasses(Error)) {
     // FIXME: Don't fail this way.
-    llvm::cerr << "ERROR: " << Error << "\n";
+    llvm::errs() << "ERROR: " << Error << "\n";
     ::exit(1);
   }