Fix various bugs in recent commits for C++ PCH.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@106995 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/DeclTemplate.cpp b/lib/AST/DeclTemplate.cpp
index ca19d1f..5984eaa 100644
--- a/lib/AST/DeclTemplate.cpp
+++ b/lib/AST/DeclTemplate.cpp
@@ -393,7 +393,8 @@
 
 TemplateArgumentList::TemplateArgumentList(ASTContext &Context,
                                            const TemplateArgument *Args,
-                                           unsigned NumArgs) {
+                                           unsigned NumArgs)
+  : NumFlatArguments(0), NumStructuredArguments(0) {
   init(Context, Args, NumArgs);
 }