RFR: 8269803: G1: remove unnecessary NoRefDiscovery [v2]

[Albert Mingkun Yang]

On Wed, 7 Jul 2021 07:30:22 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Simple change of removing the unnecessary disable of ref-discovery for CM during young-gc pause.
>> 
>> Test: hotspot_gc
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Thanks for the review.

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PR: https://git.openjdk.java.net/jdk/pull/4664