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

[Kim Barrett]

On Mon, 22 Feb 2021 16:22:36 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> test/hotspot/jtreg/gc/TestReferenceRefersToDuringConcMark.java line 28:
>> 
>>> 26: /* @test
>>> 27:  * @requires vm.gc != "Epsilon"
>>> 28:  * @requires vm.gc != "Shenandoah"
>> 
>> I think this test works for Shenandoah so long as it's not in IU mode.  Is that possible to exclude with another `@requires` constraint?
>
> 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"`

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