Appease TSAN regarding data race in profiler debug counters.

Appease TSAN regarding data race in profiler debug counters.

BUG=b/31767249
R=johnmccutchan@google.com

Committed: https://github.com/dart-lang/sdk/commit/d9311af50b7bb051cbe8a0e3f17c049df9648f42

[rmacnak, 2016-09-27 18:19:47]

rmacnak@google.com changed reviewers:
+ johnmccutchan@google.com

[Cutch, 2016-09-27 18:20:48]

LGTM w/c

https://chromiumcodereview.appspot.com/2376753002/diff/1/runtime/vm/profiler.cc
File runtime/vm/profiler.cc (right):

https://chromiumcodereview.appspot.com/2376753002/diff/1/runtime/vm/profiler....
runtime/vm/profiler.cc:72: memset(&counters_, 0, sizeof(counters_));
Zero counters should be moved above ThreadInterrupter::Startup for ASAN.

[Cutch, 2016-09-27 18:20:49]

LGTM w/c

[rmacnak, 2016-09-27 19:22:27]

https://chromiumcodereview.appspot.com/2376753002/diff/1/runtime/vm/profiler.cc
File runtime/vm/profiler.cc (right):

https://chromiumcodereview.appspot.com/2376753002/diff/1/runtime/vm/profiler....
runtime/vm/profiler.cc:72: memset(&counters_, 0, sizeof(counters_));
On 2016/09/27 18:20:48, Cutch wrote:
> Zero counters should be moved above ThreadInterrupter::Startup for ASAN.

Done.

[rmacnak, 2016-09-27 19:27:41]

Description was changed from

==========
Appease TSAN regarding data race in profiler debug counters.

BUG=b/31767249
==========

to

==========
Appease TSAN regarding data race in profiler debug counters.

BUG=b/31767249
R=johnmccutchan@google.com

Committed:
https://github.com/dart-lang/sdk/commit/d9311af50b7bb051cbe8a0e3f17c049df9648f42
==========

[rmacnak, 2016-09-27 19:27:46]

Committed patchset #2 (id:20001) manually as
d9311af50b7bb051cbe8a0e3f17c049df9648f42 (presubmit successful).