if the parameters are not already set (e.g. because it is a typedef).
Fixes crash of rdar://16128173
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@207382 91177308-0d34-0410-b5e6-96231b3b80d8
<declaration> tag of Comment XML and fixing
DeclPrint of templates along the way - wip.
//rdar://12378714
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@169453 91177308-0d34-0410-b5e6-96231b3b80d8