[RFC][PATCH] tunables: Add elision tunable

[rcardoso]

Hi Stefan,

Thanks for your review. I attached a v2 patch with you fix suggestions.

 >In addition to Paul's patches, here is a link to a newer patch from 
 >Carlos:
 >"RFC: Always-on elision with per-process opt-in using tunables."
 >https://www.sourceware.org/ml/libc-alpha/2017-05/msg00335.html
 >
 >He also removes the --enable-lock-elision configure flag.
 >Is this also required for your patch?

I'm aware of Carlos patch. In fact I talk to him before send this mail 
since we are doing similar things. And we agree that I will send this 
patch and he will word around with changes (like enable-lock-elision flag).

 >I've also used a small s390 specific test program to check wether a 
mutex was elided or not:

Pretty neat test. I see you already sent the test on this thread on 
another reply. I will try to port it to power and x86 here.

Regards,
Rogerio
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