thread-annotations branch created

[Le-Chun Wu]

Hi,

I have created the branch "thread-annotations" that contains the
implementation of the thread safety annotations and analysis
(described in http://docs.google.com/Doc?id=ddqtfwhb_0c49t6zgr). I
have committed the initial implementation and a set of new test cases
to the branch. I've also created a wiki page for the project at

http://gcc.gnu.org/wiki/ThreadSafetyAnnotation

Thanks,

Le-chun