[Bug c/68062] [4.9/5/6 Regression] ICE when comparing vectors

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68062

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
The FEs are missing a VIEW_CONVERT_EXPR around one of the operands.  But I
suppose 4.8 is correct in rejecting this compare with mismatched sign
(though the rejection isn't dependent on the sign of char).