[Bug target/99977] arm: ICE with __sync_bool_compare_and_swap and -mcpu=cortex-m23

[acoplan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99977

--- Comment #5 from Alex Coplan <acoplan at gcc dot gnu.org> ---
Fixed for trunk so far, needs backports.