Omit private_extern declarations of extern symbols; followup to
r124468.  Patch by Rafael Avila de Espindola!

llvm-svn: 126297
diff --git a/llvm/lib/MC/MCAsmInfo.cpp b/llvm/lib/MC/MCAsmInfo.cpp
index cc1afbd..8199fb2 100644
--- a/llvm/lib/MC/MCAsmInfo.cpp
+++ b/llvm/lib/MC/MCAsmInfo.cpp
@@ -65,6 +65,7 @@
   WeakDefDirective = 0;
   LinkOnceDirective = 0;
   HiddenVisibilityAttr = MCSA_Hidden;
+  HiddenDeclarationVisibilityAttr = MCSA_Hidden;
   ProtectedVisibilityAttr = MCSA_Protected;
   HasLEB128 = false;
   SupportsDebugInformation = false;