read_register_byte can't work with pseudo-reg model

[Andrew Cagney]

> I'm guessing. Try:
>> 
>> 	if (REGISTER_READ_P ())
>> 	  {
>> 	    do something fairly sane;
>> 	  }
>> 	else
>> 	  {
>> 	    all the legacy cruft including the call to
>> 	    legacy_read_register_gen() and that test.
>> 	  }
>> 
>> Thing is that there is only one target in the FSF using 
>> READ_REGISTER_P() so there is this dividing line - something using 
>> read_register_p() can be given far stronger requirements than for the 
>> older code.
> 
> 
> Which target is that, and where is READ_REGISTER_P ?  I can't find 
> anything in the either the source or the mailing lists.  Mind you, the 
> web-based mailing list search even fails to find your message when I 
> search for READ_REGISTER_P.

Sorry, register_read_p() -> sh5.
(something else on my todo list is stomp on some of these redundant 
interfaces :-)

Andrew