Don't allow line breaks after template parameters.

This fixes llvm.org/PR14786.

We will need to split there as a last resort, but that should be done
consistently independent of whether the type is a template type or not.

Before:
template <typename T>
aaaaaaaaaaaaaaaaaaa(aaaaaaaaaaaaaaaaaa, aaaaaaaaaaaaaaaaaaaaaaaaaa<T>
                    ::aaaaaaaaaa, aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa);

After:
template <typename T>
aaaaaaaaaaaaaaaaaaa(aaaaaaaaaaaaaaaaaa,
                    aaaaaaaaaaaaaaaaaaaaaaaaaa<T>::aaaaaaaaaa,
                    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa);

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171400 91177308-0d34-0410-b5e6-96231b3b80d8