RFR: 8256015: Shenandoah: Add missing Shenandoah implementation in WB_isObjectInOldGen

[Aleksey Shipilev]

On Sun, 8 Nov 2020 13:57:03 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> The test gc/TestReferenceRefersTo.java fails with Shenandoah because of a missing implementation in WB_isObjectInOldGen:
> 
> Internal Error (/home/rkennke/src/openjdk/jdk/src/hotspot/share/gc/shared/collectedHeap.hpp:207), pid=511307, tid=511422
> assert(kind == heap->kind()) failed: Heap kind 6 should be 1
> 
> This is introduced by JDK-8188055. 
> 
> Testing: hotspot_gc_shenandoah, tier1+Shenandoah, TestReferenceRefersTo.java

Looks fine and trivial.

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Marked as reviewed by shade (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1111