RFR: Enable array access instrumentation for aarch64

[Man Cao]

On Tue, 16 Jun 2020 11:39:55 GMT, Jie He <github.com+10233373+jhe33 at openjdk.org> wrote:

> Did you test the previous C1 with tsan enabled?

No. It was work-in-progress in 2017, and the author left our team and no one has picked it up afterwards. I vaguely
recall there were some issues with deoptimization, but I don't know about the details.

>  could it benefit race detection for real workload than interpreter version? as we know, interpreter will report the
>  race before C1 involved.

I don't quite get the question. tsan-in-C1 should only improve the speed of program execution, but does not affect the
coverage of race detection. Races detectable with C1 instrumentation are also detectable with interpreter-only
instrumentation. Currently TSAN should only be used in interpreter-only mode. -XX:+ThreadSanitizer implies -Xint, see
here:
https://github.com/openjdk/tsan/blob/5b22e1802c285b7a3b8764ac90da36476d08311a/src/hotspot/share/runtime/arguments.cpp#L4046

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PR: https://git.openjdk.java.net/tsan/pull/13