[rfc, spu] Don't call set_gdbarch_cannot_step_breakpoint in spu_gdbarch_init

[Yao Qi]

On 02/04/15 09:58, Pedro Alves wrote:
> If this was OSF/1 specific, then we could
> get rid of that too, and then get rid of gdbarch_cannot_step_breakpoint
> completely.  Anyone have access to Alpha GNU/Linux to try that out?

Yes, that is what I want to do too, however, I don't have access to
alpha/linux box :(

-- 
Yao (齐尧)