Fix some refactos for iostream changes (in -Asserts mode).
 - The world needs better C++ refactoring tools, can I get an Amen!?

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79843 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineFunction.cpp b/lib/CodeGen/MachineFunction.cpp
index 5bf86e3..25dfa6e 100644
--- a/lib/CodeGen/MachineFunction.cpp
+++ b/lib/CodeGen/MachineFunction.cpp
@@ -305,8 +305,8 @@
 #ifndef NDEBUG
   ViewGraph(this, "mf" + getFunction()->getNameStr());
 #else
-  cerr << "SelectionDAG::viewGraph is only available in debug builds on "
-       << "systems with Graphviz or gv!\n";
+  errs() << "SelectionDAG::viewGraph is only available in debug builds on "
+         << "systems with Graphviz or gv!\n";
 #endif // NDEBUG
 }
 
@@ -315,8 +315,8 @@
 #ifndef NDEBUG
   ViewGraph(this, "mf" + getFunction()->getNameStr(), true);
 #else
-  cerr << "SelectionDAG::viewGraph is only available in debug builds on "
-       << "systems with Graphviz or gv!\n";
+  errs() << "SelectionDAG::viewGraph is only available in debug builds on "
+         << "systems with Graphviz or gv!\n";
 #endif // NDEBUG
 }