RFR: 8337658: ZGC: Move soft reference handling out of the driver loop function [v2]

[Guoxiong Li]

On Tue, 20 Aug 2024 10:07:07 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> The ZDriver code is written to be neat and have a clear outline. The soft reference handling distracts when reading this code. I propose that we hide it a bit.
>> 
>> I've also clarified in comments and names that the code is dealing with clearing of *all* references.
>
> Stefan Karlsson has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix inconsistent naming

Looks good.

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Marked as reviewed by gli (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/20418#pullrequestreview-2250517468