hg: jdk10/hs/hotspot: 8183127: UpdateRSetDeferred should not enqueue cards for NULL references

[thomas.schatzl at oracle.com]

Changeset: b348f818304d
Author:    tschatzl
Date:      2017-07-06 10:42 +0200
URL:       http://hg.openjdk.java.net/jdk10/hs/hotspot/rev/b348f818304d

8183127: UpdateRSetDeferred should not enqueue cards for NULL references
Summary: Filter out NULL references during generating cards for an object.
Reviewed-by: mgerdin, ehelin

! src/share/vm/gc/g1/g1EvacFailure.cpp