RFR: Combine bitmap clearing with region resetting closure

[William Kemper]

On Tue, 31 Jan 2023 20:26:01 GMT, Y. Srinivas Ramakrishna <ysr at openjdk.org> wrote:

>> This change combines the two closures used to `prepare_gc`. This removes a second iteration over the regions.
>
> src/hotspot/share/gc/shenandoah/shenandoahGeneration.cpp line 213:
> 
>> 211: void ShenandoahGeneration::prepare_gc() {
>> 212:   // Reset mark bitmap for this generation (typically young)
>> 213:   reset_mark_bitmap();
> 
> Is `reset_mark_bitmap()` dead code and therefore removable now? Or, can all other usages also be removed in similar manner?

No, it's not dead. It's used by the full GC still.

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PR: https://git.openjdk.org/shenandoah/pull/208