RFR: 8256569: Add C2 compiler stress flags to CTW [v2]

[Igor Ignatyev]

On Fri, 20 Nov 2020 08:26:52 GMT, Roberto Castañeda Lozano <rcastanedalo at openjdk.org> wrote:

>> Igor Ignatyev has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   updated copyright year
>
> Thanks for doing this Igor, not a reviewer but looks good to me!

thanks for the reviews, folks. I've updated the copyright year before `/integrate`-ing

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PR: https://git.openjdk.java.net/jdk/pull/1332