Scheduler fixes (PR17808)

[Paolo Carlini]

Steven Bosscher wrote:

>Looks OK to me.  So, dunno...
>  
>
Now, if the code added by Andreas doesn't work at all for you, other
testcases (in libstdc++-v3, for instance) should spuriously fail on
ia64, or at least did, the last time I checked (a few months ago,
sorry). Maybe the problem is caused by the specific version of DejaGNU
that you are using!?! I'm just guessing, something is misbehaving in the
testing harness...

Paolo.