RFR: 8310143: RandomCommandsTest fails due to unexpected VM exit code after JDK-8282797

[Tobias Hartmann]

On Fri, 16 Jun 2023 10:28:12 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

> The fix for [JDK-8282797](https://bugs.openjdk.org/browse/JDK-8282797) missed that randomly generated Compile Commands can be invalid. I verified with the corresponding seeds that all occurrences of this intermittent failure are now fixed.
> 
> Thanks,
> Tobias

Thanks for the reviews, Vladimir and Roberto! My testing caught failures because I accidentally declared the `isValid` field outside of the loop but it should be re-set to `true` after each iteration.

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PR Comment: https://git.openjdk.org/jdk/pull/14514#issuecomment-1597004486