[RFC] Tunable elision patch for siddhesh/tunables

[Paul E. Murphy]

Siddhesh et al,

In continuing the glibc tunables discussion, I've made some
additional patches which I think would help our work on the
siddhesh/tunables branch.

I've split this into two patches:

* The first should enable tunables to initialize without
calling malloc(), and prior to __environ being set.

* The second adds a common tunables initialization function
for elision, and enables it for supported archs.

I have tested this on PPC64. I need help testing for
supported s390 and x86 platforms.

Thanks,
Paul
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