[Bug c++/79986] [6/7 Regression][CHKP] ICE in fold_convert_loc with a flexible array

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79986

--- Comment #6 from Martin Sebor <msebor at gcc dot gnu.org> ---
Minimal patch submitted for review:
https://gcc.gnu.org/ml/gcc-patches/2017-03/msg01062.html