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Auto merge of #31684 - tmiasko:alternate-stack, r=alexcrichton
authorbors <bors@rust-lang.org>
Thu, 18 Feb 2016 23:23:22 +0000 (23:23 +0000)
committerbors <bors@rust-lang.org>
Thu, 18 Feb 2016 23:23:22 +0000 (23:23 +0000)
Remove alternate stack with sigaltstack before unmaping it.

Also reuse existing signal stack if already set, this is especially
useful when working with sanitizers that configure alternate stack
themselves.

This change depends on SS_DISABLE recently introduced in libc crate and updates
this git submodule accordingly.


Trivial merge
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