[RFA] Displaced stepping just enable in non-stop mode

[Pedro Alves]

Hi teawater,

Thanks again for doing this.  I believe your patch is close to being OK.  I
took the liberty of adjusting it a bit, mostly re-wording a bit the
comments and the documentation.

I think Joel's suggestion was a good one:  By gaining an "auto"
setting, this is as much a maintainer command as
"set breakpoint always-inserted" is.  So, I believe it's time we move
the command to the top level "set" command group.

 set can-use-displaced-stepping (auto|on|off)

Eli, can I ask you to go over the help strings and the documentation in
the patch below?  Do they look OK-ish?

-- 
Pedro Alves
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