hg: jdk/sandbox: 2 new changesets

[shade at redhat.com]

Changeset: 76031ce7a413
Author:    shade
Date:      2020-07-30 11:16 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/76031ce7a413

Merge


Changeset: 17f1f3fc8ede
Author:    shade
Date:      2020-07-30 11:27 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/17f1f3fc8ede

Optimize GetReferenceObjects: omit null objects

! src/hotspot/share/prims/jvm.cpp
! src/java.base/share/classes/java/lang/Runtime.java
! test/jdk/java/lang/RuntimeTests/Ofs/DeepSizeOf.java