[Bug c++/61971] [4.9 Regression] array subscript is above array bounds [-Werror=array-bounds]

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61971

--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Let's add the reduced testcase to trunk.