RFR (S) 8242114: Shenandoah: remove ShenandoahHeapRegion::reset_alloc_metadata_to_shared

[Roman Kennke]

Ok!

Roman


> RFE:
>   https://bugs.openjdk.java.net/browse/JDK-8242114
> 
> This is a follow-up after removal of shared-alloc-counter (JDK-8241841) and removal of Traversal
> (JDK- 8242082). ShenandoahHeapRegion::reset_alloc_metadata_to_shared is now the same as
> ShenandoahHeapRegion::reset_alloc_metadata. Humongous allocation path also does not need resets,
> because the alloc metadata is already clean there.
> 
> Webrev:
>  https://cr.openjdk.java.net/~shade/8242114/webrev.01/
> 
> Testing: hotspot_gc_shenandoah
>