Re: [mep] RFA: Use new rtl iterators in global_reg_mentioned_p

[DJ Delorie]

>       * config/mep/mep.c: Include rtl-iter.h.
>       (global_reg_mentioned_p_1): Take a const_rtx and return a bool.
>       (xtensa_tls_referenced_p): Return a bool.  Use FOR_EACH_SUBRTX.

OK.