PR c++/87075 - ICE with constexpr array initialization.
My patch of 2016-08-26 to avoid calling a trivial default constructor
introduced TARGET_EXPRs initialized with void_node to express trivial
initialization. But when this shows up in a VEC_INIT_EXPR, we weren't
prepared to handle it. Fixed by handling it explicitly in
cxx_eval_vec_init_1.
* constexpr.c (cxx_eval_vec_init_1): Handle trivial initialization.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@264442 138bc75d-0d04-0410-961f-82ee72b054a4