https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118131

--- Comment #1 from Christophe Lyon <clyon at gcc dot gnu.org> ---
This is because arm.cc:arm_attr_length_move_neon() does not handle the new MVE
struct modes, which correspond to OImode and XImode.

Adding them leads to a crash later because in neon.md we have
(define_split
  [(set (match_operand:OI 0 "s_register_operand" "")
        (match_operand:OI 1 "s_register_operand" ""))]
which does not support the new modes either.

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