RFR: 8272235: G1: update outdated code root fixup [v2]

[Kim Barrett]

On Tue, 10 Aug 2021 20:46:57 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Simple change of updating outdated comments and certain renaming.
>> 
>> Test: hotspot_gc
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Marked as reviewed by kbarrett (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/5073