RFR: 8344321: GenShen: Fix various sonar scan warnings

[Y. Srinivas Ramakrishna]

On Tue, 19 Nov 2024 18:19:47 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Various sonar warnings are fixed: 
> * unused variables removed
> * implicit casts made explicit
> * members are all initialized

src/hotspot/share/gc/shenandoah/shenandoahEvacTracker.cpp line 37:

> 35:     _evacuations_attempted(0), _bytes_attempted(0),
> 36:     _use_age_table(ShenandoahGenerationalCensusAtEvac || !ShenandoahGenerationalAdaptiveTenuring),
> 37:     _age_table(nullptr) {

Good catch; thanks!

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PR Review Comment: https://git.openjdk.org/shenandoah/pull/544#discussion_r1849054720