RFR: 8269803: G1: remove unnecessary NoRefDiscovery

[Kim Barrett]

On Mon, 5 Jul 2021 09:31:37 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> I think the comment beginning `g1CollectedHeap.hpp:929` should be adapted too.
> 
> Looks good otherwise.

Other than the mentioned need for a comment update, I also thing this looks good.

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