RFR: 8274466 G1: use field directly rather than method in G1CollectorState::in_mixed_phase [v2]

[Stefan Johansson]

On Thu, 30 Sep 2021 01:34:28 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> This is a minor improvement which remove the redundant G1 Collector states usages.
>
> Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Revert wrong code

Marked as reviewed by sjohanss (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/5745