TSX lock elision for glibc v2

[Andi Kleen]

> What about the internal locks used in the condvar and rwlock
> implementations?  We might perhaps be able to build better concurrent

x86 rwlocks don't use locks, and I already elide then.
Please see patch 6/10

Condition variables may be done at some point. But it will also
only help specific cases -- as soon as the condition
variable blocks it has to abort of course. Code contributions 
welcome.

-Andi

-- 
ak@linux.intel.com -- Speaking for myself only.