[SH] regs command

[Joel Brobecker]

> This means you registered "regs" before the thing it aliases was
> registered.  This can happen because _initialize_xxx order is not
> defined.
> 
> There's no easy fix :(.  You could move "regs" initialization to a
> better spot but then it will be visible in all builds of gdb, not just
> those with this target compiled in.

It seems better in that case to just go with what Thomas had initially,
maybe just adding a comment why we don't use an alias?  It's only for
a few weeks...

-- 
Joel