RFR: 8266618: Remove broken -XX:-OptoRemoveUseless

[Tobias Hartmann]

On Thu, 6 May 2021 07:49:01 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

> Similar to [JDK-8266542](https://bugs.openjdk.java.net/browse/JDK-8266542), simply running `java -XX:-OptoRemoveUseless` already crashes the VM. I propose to remove this debug flag.
> 
> Thanks,
> Tobias

Thanks for the review, Vladimir!

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PR: https://git.openjdk.java.net/jdk/pull/3896