Merge the dynamic annotations from ThreadSanitizer r3424.

Merge the dynamic annotations from ThreadSanitizer r3424.
This introduces two major changes:
- each annotation has a non-trivial implementation which prevents identical code folding
- ANNOTATE_HAPPENS_BEFORE and ANNOTATE_HAPPENS_AFTER are separated from ANNOTATE_CONDVAR_{SIGNAL,WAIT}.
The corresponding annotation functions are supported by ThreadSanitizer as of r3075

TEST=trybots
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=84975

[Alexander Potapenko, 2011-05-11 12:05:43]

On 2011/05/11 11:21:24, Timur Iskhodzhanov wrote:

Have you split the lines that are longer than 80 chars? If so, I suggest not to
do this, because of the growing complexity of merging the files.
If not, LGTM provided that the TSan trybot passes. And thank you!

[Timur Iskhodzhanov, 2011-05-11 12:07:08]

I fixed them by copying the new upstream version with shorter lines.

On 2011/05/11 12:05:43, Alexander Potapenko wrote:
> On 2011/05/11 11:21:24, Timur Iskhodzhanov wrote:
> 
> Have you split the lines that are longer than 80 chars? If so, I suggest not
to
> do this, because of the growing complexity of merging the files.
> If not, LGTM provided that the TSan trybot passes. And thank you!

[Timur Iskhodzhanov, 2011-05-11 12:25:55]

Hi William,

Can you please review this CL?

The diff is basically just a copy of the upstream version of dynamic_annotations
in the TSan repository

Thanks,
Timur

[Timur Iskhodzhanov, 2011-05-11 13:58:28]

FYI I believe the mac and linux_tsan failures are unrelated.
The linux_tsan failure is similar to that happening on the memory waterfall

[willchan no longer on Chromium, 2011-05-11 14:18:46]

LGTM

[Timur Iskhodzhanov, 2011-05-11 14:31:02]

Thanks!