[Bug c++/110323] [11/12/13/14 Regression] Code for explicit instantiation of template method of template class not generated

["mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110323

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2
                 CC|                            |mpolacek at gcc dot gnu.org

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r11-291-g0f50f6daa14018:

commit 0f50f6daa140186a048cbf33f54f4591eabf5f12
Author: Jason Merrill <jason@redhat.com>
Date:   Mon May 11 15:46:59 2020 -0400

    c++: tree walk into TYPENAME_TYPE.

```
template<bool B, class T, class F>
struct conditional { using type = T; };

template<class T, class F>
struct conditional<false, T, F> { using type = F; };

constexpr int VAL = 1;

struct foo {
    template <int B>
    void bar(typename conditional<B==VAL, int, float>::type arg) {
    }
};

template void foo::bar<1>(int arg);
```