RFR: 8262379: Add regression test for JDK-8257746

[Severin Gehwolf]

On Thu, 25 Feb 2021 16:27:20 GMT, Severin Gehwolf <sgehwolf at openjdk.org> wrote:

> Fails prior the patch of JDK-8257746, passes after. As expected.
> 
> Thoughts?

@poonamparhar @hseigel Could you please take a look? It's just a simple regression test for the JDK-8257746 NPE regression.

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PR: https://git.openjdk.java.net/jdk/pull/2725