RFR: 8256664: Shenandoah: Cleanup after JDK-8212879

[Roman Kennke]

On Fri, 20 Nov 2020 02:04:26 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> JDK-8212879 removed last serial weak roots, that means:
> 
> 1) Concurrent GC no longer needs to cleanup any weak roots at pause
> 2) Root verifier no longer needs to distinguish concurrent/serial weak roots.
> 
> Test:
> - [x] hotspot_gc_shenandoah

Looks good to me! Thank you!

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Marked as reviewed by rkennke (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1336