RFR: 8256664: Shenandoah: Cleanup after JDK-8212879

[Roman Kennke]

On Fri, 20 Nov 2020 11:43:48 GMT, Roman Kennke <rkennke 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!

There is one failure in tier1/linux/x86_64, make sure this is not caused by this change!

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