[cfe-commits] Threadsafety: support for guarded_by/var and pt_guarded_by/var annotations

[Caitlin Sadowski]

This patch adds basic handling for pt_guarded_by/var and
guarded_by/var annotations. We identify situations where we are
accessing (reading or writing) guarded variables, and report an error
if the appropriate locks are not held. Any code review comments are
appreciated.

http://codereview.appspot.com/4954041

Cheers,

Caitlin
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