[Bug target/64542] ARM use of ARM instruction on Thumb-only target

[rearnsha at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64542

--- Comment #4 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Note that armv6-m doesn't support ARM instructions at all, so the .arm
directive is meaningless.