[Bug c++/115645] [12/13/14 Regression] new S[1][1]() requires non-explicit default ctor since r11-3092

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115645

--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
This looks safe enough to backport?