Avoid warnings.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@72976 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/DeclTemplate.cpp b/lib/AST/DeclTemplate.cpp
index 11b9275..a534164 100644
--- a/lib/AST/DeclTemplate.cpp
+++ b/lib/AST/DeclTemplate.cpp
@@ -240,6 +240,7 @@
 //===----------------------------------------------------------------------===//
 void TemplateArgumentListBuilder::push_back(const TemplateArgument& Arg) {
   switch (Arg.getKind()) {
+  default: break;
   case TemplateArgument::Type:
     assert(Arg.getAsType()->isCanonical() && "Type must be canonical!");
     break;