RFR: 8263971: C2 crashes with SIGFPE with -XX:+StressGCM and -XX:+StressIGVN [v3]

[Roland Westrelin]

On Thu, 25 Mar 2021 12:59:38 GMT, Jie Fu <jiefu at openjdk.org> wrote:

> I don't think `-XX:+UnlockDiagnosticVMOptions` is enough since `StressGCM` is a C2-only flag.
> 
> What will happen if there is no c2 compiler?

Right. Command line option added.

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