[PATCH] PR libstdc++/85843 fix "should be explicitly initialized" warnings

[Jason Merrill]

On Sun, May 20, 2018 at 7:50 PM, Jonathan Wakely <jwakely@redhat.com> wrote:
>         PR libstdc++/85843
>         * src/c++11/cow-stdexcept.cc (logic_error, runtime_error): Explicitly
>         initialize base class to avoid warnings.

And this patch fixes the warning to treat defaulted constructors the
same as implicitly-declared constructors.

Tested x86_64-pc-linux-gnu, applying to trunk.
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