Merge branch 'master' into work-packets

Author: wenyuzhao

COPYRIGHT

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+Copyrights in the MMTk project are retained by their contributors. No
+copyright assignment is required to contribute to the MMTk project.
+
+Some files may include explicit copyright notices and/or license notices.
+For full authorship information, see the version control history.
+
+Except as otherwise noted (below and/or in individual files), MMTk is
+licensed under the Apache License, Version 2.0 <LICENSE-APACHE> or
+<http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+<LICENSE-MIT> or <http://opensource.org/licenses/MIT>, at your option.