RFR: 8263427: Shenandoah: Trigger weak-LRB even when heap is stable [v5]

[Aleksey Shipilev]

On Tue, 16 Mar 2021 09:50:32 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Roman Kennke has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - Remove unused code. Move ShenandoahRendezvousClosure close to where it's used.
>>  - Rename 'disable weak roots' -> 'final roots' everywhere
>
> This looks good to me, with a minor nit.

Also, pull from master to get Windows builds fixed.

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PR: https://git.openjdk.java.net/jdk/pull/2945