hg: jdk/jdk: 8173196: [REDO] C2 does not optimize redundant memory operations with G1

[rwestrel at redhat.com]

Changeset: 9691a169f1dd
Author:    roland
Date:      2019-05-21 15:46 +0200
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/9691a169f1dd

8173196: [REDO] C2 does not optimize redundant memory operations with G1
Reviewed-by: thartmann, kvn

! src/hotspot/share/gc/g1/c2/g1BarrierSetC2.cpp
! src/hotspot/share/gc/shared/c2/cardTableBarrierSetC2.cpp
! src/hotspot/share/opto/graphKit.cpp
! src/hotspot/share/opto/graphKit.hpp