[Bug target/68617] arm ice output_operand: invalid %-code for -march=armv6k + thumb

[chrbr at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68617

--- Comment #2 from chrbr at gcc dot gnu.org ---
unaligned_access flag now depend on TARGET_32BIT, which is sensitive to the
attribute target.
Should be made Save in arm.opt and handled in override_options_internal. But
this is still not enough to make the test pass.