SOFTWARE_SINGLE_STEP_P and multi-arch

[Richard Earnshaw]

ac131313@cygnus.com said:
> Make SOFTWARE_SINGLE_STEP Multi arch.
> 	(and I don't like it but I can't think
> 	of a better incremental move :-)
> 	While I think SOFTWARE_SINGLE_STEP()
> 	should be replaced by code that creates
> 	temp breakpoints and adds them to
> 	the breakpoint database (gdb would
> 	later pull them directly) I don't want
> 	to try and also do that.
> 	The way software single step is
> 	currently implemented is just ulgh... 

It also doesn't work with INSTRUCTION_NULLIFIED, which is a pity, since on 
the ARM we really want both.

R.