[patch, rfa:ppc64, rfa:breakpoint] Add non-verbose breakpoint adjustment

[Andrew Cagney]

>> For breakpoint.c, I've also modified the warnings so that the warning:
>> 
>> warning: Breakpoint 2 address previously adjusted from 0x104e5a60 to 
>> 0x100895d0.
>> 
>> no longer occures - I figure that the user will have noted it when the 
>> breakpoint was set.  It could also be made per-breakpoint?
> 
> 
> I would prefer that gdb issue warnings both at the time the breakpoint
> was set and when it gets hit.  Or at least until we have more
> experience with it and find that the second warning unduly annoys
> users.

As a user, it annoyed me :-)

If you'd prefer I'll let PPC64 print both warnings as well.

> How about calling gdbarch_adjust_breakpoint_address() to find out if
> the second warning should be printed?  Alternately, we could add a
> field to the breakpoint struct, but this seems like overkill.

Andrew