FixIt insert 'static' for anonymous unions at global or namespace scope.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@142566 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Sema/SemaDecl.cpp

@@ -2653,7 +2653,8 @@ Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS,
           (isa<TranslationUnitDecl>(Owner) ||
            (isa<NamespaceDecl>(Owner) &&
             cast<NamespaceDecl>(Owner)->getDeclName()))) {
-        Diag(Record->getLocation(), diag::err_anonymous_union_not_static);
+        Diag(Record->getLocation(), diag::err_anonymous_union_not_static)
+          << FixItHint::CreateInsertion(Record->getLocation(), "static ");
         Invalid = true;
   
         // Recover by adding 'static'.