RFR: 8263971: C2 crashes with SIGFPE with -XX:+StressGCM and -XX:+StressIGVN [v2]

[Jie Fu]

On Thu, 25 Mar 2021 12:50:33 GMT, Roland Westrelin <roland at openjdk.org> wrote:

>> `-XX:+UnlockDiagnosticVMOptions` should be enough.
>
> Thanks for looking at this
> 
>> `-XX:+UnlockDiagnosticVMOptions -XX:+IgnoreUnrecognizedVMOptions` should be added for the test, right?
> 
> I added -XX:+UnlockDiagnosticVMOptions so the test can be run with a release build.

I don't think `-XX:+UnlockDiagnosticVMOptions` is enough since `StressGCM` is a C2-only flag.

What will happen if there is no c2 compiler?
Thanks.

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PR: https://git.openjdk.java.net/jdk/pull/3190