hg: jdk9/hs-gc/hotspot: 8066441: Add PLAB trace event

[marcus.larsson at oracle.com]

Changeset: 29df282f63fe
Author:    sfriberg
Date:      2014-12-03 09:27 -0800
URL:       http://hg.openjdk.java.net/jdk9/hs-gc/hotspot/rev/29df282f63fe

8066441: Add PLAB trace event
Reviewed-by: tschatzl, ehelin, egahlin

! src/share/vm/gc_implementation/shared/gcTrace.cpp
! src/share/vm/gc_implementation/shared/gcTrace.hpp
! src/share/vm/gc_implementation/shared/gcTraceSend.cpp
! src/share/vm/trace/trace.xml