hg: jdk9/hs-rt/hotspot: 8071507: (ref) Clear phantom reference as soft and weak references do

[kim.barrett at oracle.com]

Changeset: 107dae30be84
Author:    kbarrett
Date:      2015-12-28 13:48 -0500
URL:       http://hg.openjdk.java.net/jdk9/hs-rt/hotspot/rev/107dae30be84

8071507: (ref) Clear phantom reference as soft and weak references do
Summary: GC clears phantom refs on notification; update spec accordingly.
Reviewed-by: mchung, jmasa

! src/share/vm/gc/shared/referenceProcessor.cpp