RFR: 8262049: [TESTBUG] Fix TestReferenceRefersTo.java for Shenandoah IU mode [v3]

[Roman Kennke]

On Tue, 23 Feb 2021 08:24:51 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> How would I do that? IU mode can only be distinguished by VM flag.
>
> I've not tried it, but this might work.
> `@requires vm.gc != "Shenandoah" | vm.opt.ShenandoahGCMode != "iu"`

Indeed, it does. I changed the test requires accordingly.

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PR: https://git.openjdk.java.net/jdk/pull/2653