RFR: Enable aarch64 build in jdk/tsan.

[Arthur Eubanks]

On Thu, 16 Apr 2020 02:14:30 GMT, Man Cao <manc at openjdk.org> wrote:

>> Enable INCLUDE_TSAN in aarch64, and add the option -fno-experiment-isel when build aarch64 to
>> avoid a known bug [1] in llvm-8, recommended compiler in jdk/tsan,
>> which generates wrong debug info.
>> 
>> In addition, change aarch64 release build option from -O3 to -Os to prevent a crash occurs
>> in build process, caused by a known issue [2].
>> 
>> [1] https://bugs.llvm.org/show_bug.cgi?id=40887
>> [2] https://bugs.llvm.org/show_bug.cgi?id=44581
>
> 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.

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