[Patch] Improving jump-thread pass for PR 54742

[Sebastian Pop]

Sebastian Pop wrote:
> Jeff Law wrote:
> > I'm a bit worried about compile-time impacts of the all the
> > recursion
> 
> I will also restrict the recursion to the loop in which we look for the FSM
> thread.

The attached patch includes this change.  It passed bootstrap and regression
test on x86_64-linux.  Ok to commit?

Thanks,
Sebastian
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