RFR: 8254320: Shenandoah: C2 native LRB should activate for non-cset objects [v3]

[Aleksey Shipilev]

On Mon, 12 Oct 2020 10:54:46 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> In C2 native-LRB, we don't call the slow-path when the reference is not in cset. However, it may need to return NULL
>> for non-cset objects too, in order to prevent accidental ressurrection of referenced object.
>
> Roman Kennke has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add comment why native-LRB doesn't need the cset-check

Marked as reviewed by shade (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/580