S12Z: gas: Permit "extend" instructions which don't actually extend.
Other assemblers permit "extending" a register into a register of a smaller size or the same size. It doesn't make much sense to do this but would appear to be a valid instruction. So change the error to a warning. gas/ * config/tc-s12z.c (tfr): Change as_bad to as_warn. Also fix message typo and semantics.