[rfc; rfa:i386] Eliminate save_dummy_frame_tos

[Andrew Cagney]

Hello,

This patch removes the need for setting the save_dummy_frame_tos method 
(d10v and i386).  Instead the frame ID stack addr returned by 
push_dummy_call is saved (by generic_save_dummy_frame_tos) and used as 
the dummy breakpoint ID.

The i386 and d10v don't show any regressions.

Mark, look right?
I'd like to add a comment to the ``return sp + 8'' only I'm not actually 
sure what's going on here :-/

Andrew
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