[patch] Use displaced stepping regardless of SW single step

[Yao Qi]

On 09/06/2011 09:43 PM, Pedro Alves wrote:
> But it is.  Displaced stepping is only necessary to step over breakpoints
> (trap_expected) without removing them.  If there's no breakpoint at the
> current instruction, we can just do a normal step.

Yeah, that is true.  Looks my head has been oriented to software single 
step for a long time.  Please ignore my patch.

-- 
Yao (齐尧)