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.