tree daca135aa7681a8ad210aa3a4f3f8db67e914a46
parent 0b05ec674139c2b2e0914b0bb0e1898f93a9c852
author Mathieu Chartier <mathieuc@google.com> 1408827363 -0700
committer Mathieu Chartier <mathieuc@google.com> 1409076128 -0700

Fix race condition in TransitionCollector.

There was a minor race condition that could happen if multiple
threads called TransitionCollector at the same time. Starting out
in CMS:

Thread 1: TransitionCollector(SS).
Thread 2: TransitionCollector(CMS) sees that it is already CMS so
has copying_transition == false. But then thread 2 changes to SS.
Thread 1 resumes but incorrectly doesn't check the
disable_moving_gc_count_ possibly resulting in errors if
disable_moving_gc_count_ != 0 due to JNI since we are going from
SS -> CMS and are goign to move objects.

(cherry picked from commit de2233bbf64c7dde96513a729f6a97aebc2f0424)

Change-Id: I2fdda85f7cb7cbb0df3d1466a3c74853c5304c1b