Thread safety: added support for function scopes in attribute arguments.

This patch was written by DeLesley Hutchins.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@139302 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/DeclBase.cpp b/lib/AST/DeclBase.cpp
index 1dec71c..f846648 100644
--- a/lib/AST/DeclBase.cpp
+++ b/lib/AST/DeclBase.cpp
@@ -133,6 +133,10 @@
   return isa<FunctionDecl>(this) || isa<FunctionTemplateDecl>(this);
 }
 
+bool Decl::isTemplateDecl() const {
+  return isa<TemplateDecl>(this);
+}
+
 bool Decl::isDefinedOutsideFunctionOrMethod() const {
   for (const DeclContext *DC = getDeclContext(); 
        DC && !DC->isTranslationUnit();