RFR: Enable aarch64 build in jdk/tsan.

[Man Cao]

On Fri, 17 Apr 2020 18:52:26 GMT, Arthur Eubanks <aeubanks at openjdk.org> wrote:

>> I have also sent Skara a question about "/covered" command and OCA.
>> https://mail.openjdk.java.net/pipermail/skara-dev/2020-April/002375.html
>
> This looks fine, but I would also prefer this be submitted in jdk/jdk, then we can merge that into jdk/tsan.

Looks good!

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PR: https://git.openjdk.java.net/tsan/pull/5