RFR: 8051680: (ref) unnecessary process_soft_ref_reconsider

[Kim Barrett]

On Fri, 2 Jul 2021 12:59:03 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> This PR consists of 3 commits:
> 
> 1. Removes the soft-ref reconsideration phase because the soft-ref policy is set before marking (JDK-8269596) and stays the same across the GC cycle. Reconsideration phase should not find anything interesting. That being said, there might be some benefit of using more precise heap usage after marking for soft-ref processing, created JDK-8269798 for exploring that.
> 
> 2. Removes reloading of `_soft_ref_timestamp_clock` from `java_lang_ref_SoftReference::clock();` because the master clock should only be changed by GC.
> 
> 3. Rename phase{2,3,4} to phase{1,2,3}.
> 
> Test: hotspot_gc

I would prefer to have the renaming done in a separate PR.

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PR: https://git.openjdk.java.net/jdk/pull/4667