[patch rfc, rfa:doco] Working on-stack generic dummy frames

[Andrew Cagney]

Hello,

This patch makes all the changes necessary to get breakpoint on-stack 
call dummys working.  Until the ``set call breakpoint-location'' command 
is added, a target will need to explicitly set the call dummy location 
to on stack.

I've tested it with the d10v.

The actual change involves:

- burry all the old FIX_CALL_DUMMY code in a new function 
legacy_push_dummy_code (clearing the way for their deprecation)

- addition of the architecture vector method push_dummy_code that is 
responsible for allocating space for a breakpoint (and anything else) on 
the stack (there is a default)

- adding a d10v_push_dummy_code
This needed to handle an DADDR (the SP) vs IADDR (the BP_ADDR) problem

- pass the BP_ADDR to push_dummy_call (instead of dummy_addr)

I'll look to commit this in a few days.

Andrew

PS: Tasks, such as modifying "infrun.c" so that it will treat a SIGSEG 
on a breakpoint instruction as a breakpoint, and changing the SPARC to 
to this mechanism, are left as exercises for the reader :-)
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