RFR: Add generational full gc support

[Kelvin Nilsen]

On Fri, 27 Aug 2021 15:33:45 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> In situations when Generational Shenandoah triggers full-gc, we now allow full gc to run.  The implementation of full gc preserves the distinction between young and old memory regions because premature promotion of young objects into old regions may result in inefficient subsequent old-gc efforts.
>
> src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.cpp line 861:
> 
>> 859:            p2i(top()), p2i(ctx->top_at_mark_start(this)), p2i(this->get_update_watermark()), p2i(ctx->top_bitmap(this)));
>> 860:     fflush(stdout);
>> 861: #endif
> 
> Aha, here it comes. Maybe make this a proper log_trace() or log_debug() ?

Removed.

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PR: https://git.openjdk.java.net/shenandoah/pull/61