[PATCH/RFC/RFA] Print in-memory struct return values

[Andrew Cagney]

> The current GDB doesn't print the return value when using `finish' for
> functions return structures that are not returned in registers.  Note
> that this is a regression from GDB 6.0 for many systems.  Anyway, the
> attached patch provides a way to fix this, and adds the necessary
> support to the i386 target.
> 
> If there are no comments, I'll check this in in a few days.  Eli, is
> the doc bit OK?

Why not add another member to `enum return_value_convention' so that 
return_value() can directly differentate between these two cases?

Andrew

> Index: ChangeLog
> from  Mark Kettenis  <kettenis@gnu.org>
>  
> 	* gdbarch.sh (gdbarch_return_value_address): New method.
> 	* gdbarch.h, gdbarch.c: Re-generate.
> 	* infcmd.c (print_return_value): Use new
> 	gdbarch_return_value_address method if provided.
> 	* i386-tdep.c (i386_return_value_address): New function.
> 	(i386_gdbarch_init): Set return_value_address.
>