[Bug target/91050] -mdejagnu-cpu=<cpu> does not affect the -m<cpu> assembler option

[bergner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91050

--- Comment #6 from Peter Bergner <bergner at gcc dot gnu.org> ---
(In reply to Peter Bergner from comment #5)
> Shouldn't we check whether the new .machine <cpu> is different than the
> currently active cpu value before reloading the opcode table?  I don't think
> it would be too hard to do and would solve stupid user tricks like:

Actually, gas' ppc_machine() already ignores .machine directives if it matches
the currently active cpu, so no code needed.  That means we'll never reload the
opcode table unless we really have to.