RFR: Enable aarch64 build in jdk/tsan.

[Arthur Eubanks]

On Mon, 20 Apr 2020 04:04:33 GMT, Jie He <github.com+10233373+jhe33 at openjdk.org> wrote:

>> Looks good!
>
> I'm not sure if jdk/jdk upstream could accept these configuration, they are workaround.

We've had workarounds before with clang + Linux submitted upstream, the one example that comes to mind is increasing
the inlining threshold via a compiler flag for performance since Clang is less willing to inline. But I suppose leaving
it here for now is fine.

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