[patch rfc] push_dummy_call return a frame ID; eliminate need for read_fp

[Eli Zaretskii]

> Date: Tue, 22 Apr 2003 18:24:19 -0400
> From: Andrew Cagney <ac131313@redhat.com>
> 
> This patch modifies the architecture method push_dummy_call() so that it
> returns a frame ID, and not just a stack pointer.  That frame ID is then
> used:

Okay for the manual patch.