Add CommonLinkage, in a way that preserves the

behavior on old .bc files.

llvm-svn: 51210

llvm/tools/lto2/LTOModule.cpp

@@ -203,6 +203,9 @@ void LTOModule::addDefinedSymbol(GlobalValue* def, Mangler &mangler,
             attr |= LTO_SYMBOL_DEFINITION_TENTATIVE;
         }
     }
+    else if ( def->hasCommonLinkage()) {
+        attr |= LTO_SYMBOL_DEFINITION_TENTATIVE;
+    }
     else { 
         attr |= LTO_SYMBOL_DEFINITION_REGULAR;
     }