[Bug middle-end/92333] missing variable name referencing VLA in warnings

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92333

--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
The ICE is caused by int_const_binop (TRUNC_DIV_EXPR, maxbound, eltsize)
returning a nul for constant arguments, and caller assuming it's non-null.  The
poly_int_binop function apparently doesn't know how to do TRUNC_DIV_EXP for
constant poly_int arguments.  I don't know if that's just because it hasn't
been needed anywhere else up until now or because of some inherent limitation
of these poly_ints.