Add TemplateArgument::CreatePackCopy() to create a new parameter pack
in ASTContext-allocated memory, copying the provided template
arguments. Use this new routine where we can. No functionality change.

llvm-svn: 123289
diff --git a/clang/lib/AST/DeclTemplate.cpp b/clang/lib/AST/DeclTemplate.cpp
index b7a586cb..6e08854 100644
--- a/clang/lib/AST/DeclTemplate.cpp
+++ b/clang/lib/AST/DeclTemplate.cpp
@@ -338,11 +338,8 @@
       Arg = TemplateArgument(TemplateName(TTP), TTP->isParameterPack());
     }
     
-    if ((*Param)->isTemplateParameterPack()) {
-      TemplateArgument *Pack = new (Context) TemplateArgument [1];
-      *Pack = Arg;
-      Arg = TemplateArgument(Pack, 1);
-    }
+    if ((*Param)->isTemplateParameterPack())
+      Arg = TemplateArgument::CreatePackCopy(Context, &Arg, 1);
     
     TemplateArgs.push_back(Arg);
   }