RFR: 8278826: Print error if Shenandoah flags are empty (instead of crashing) [v2]

[Hamlin Li]

On Thu, 16 Dec 2021 14:07:26 GMT, Dmitry Chuyko <dchuyko at openjdk.org> wrote:

>> ShouldNotReachHere() is replaced by vm_exit_during_initialization() in few places where ShenandoahGCMode and ShenandoahGCHeuristics are examined.
>> 
>> Generic testing: gc/shenandoah jtreg tests.
>
> Dmitry Chuyko has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Flipped ShenandoahGCHeuristics null check

Thanks for updating, still good.

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PR: https://git.openjdk.java.net/jdk/pull/6842