Elliott Hughes e959a3b315 Remove the global lock around thread stack creation.
This lock has been here since the original commits, but as far as I can tell
it never served any purpose. We've never had a free list of cached stacks or
anything like that.

Change-Id: I9d665c7eaa9c699ce0659ffb111402a0239fe1f5
2014-07-10 10:25:26 -07:00
..
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