RFR: 8262049: [TESTBUG] Shenandoah: Adjustments in TestReferenceRefersTo.java for IU mode

[Kim Barrett]

On Sat, 20 Feb 2021 14:01:51 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Shenandoah's IU mode allows referents to be cleared even when accessed during concurrent marking. The test TestReferenceRefersTo.java needs to be adjusted to allow for that.
>> 
>> Test:
>>  - [x] TestReferenceRefersTo.java + Shenandoah/IU
>>  - [x] TestReferenceRefersTo.java + Shenandoah/SATB
>>  - [x] TestReferenceRefersTo.java + G1
>
> Changes requested by kbarrett (Reviewer).

Because this is a shared test, I suggest renaming the bug to something like "[TESTBUG] Fix TestReferenceRefersTo.java for Shenandoah IU mode", and remove the gc-shenandoah label.

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