[RFA] gdbarch.sh: add IN_SOLIB_RETURN_TRAMPOLINE

[Andrew Cagney]

> This is a macro used by mips, hppa, and rs6000.  It was a fairly
> straightforward addition to gdbarch.sh -- I just copied what was
> in there for IN_SOLIB_CALL_TRAMPOLINE.
> 
> 2002-08-20  Michael Snyder  <msnyder@redhat.com>
> 
> 	* gdbarch.sh (IN_SOLIB_RETURN_TRAMPOLINE): Add.
> 	* gdbarch.c, gdbarch.h: Regenerate.
> 	* arch-utils.c, arch-utils.h (generic_in_solib_return_trampoline):
> 	Add.

Don't forget to also zap:
infrun.c:#ifndef IN_SOLIB_RETURN_TRAMPOLINE
infrun.c:#define IN_SOLIB_RETURN_TRAMPOLINE(pc,name)    0

Andrew