hg: jdk/sandbox: 8248226: TestCloneAccessStressGCM fails with -XX:-ReduceBulkZeroing

[chris.hegarty at oracle.com]

Changeset: ae002489df78
Author:    chagedorn
Date:      2020-07-07 13:00 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/ae002489df78

8248226: TestCloneAccessStressGCM fails with -XX:-ReduceBulkZeroing
Summary: Taking GC barriers into account in LoadNode::find_previous_arraycopy() when ReduceInitialCardMarks is disabled.
Reviewed-by: kvn, roland

! src/hotspot/share/opto/memnode.cpp
! test/hotspot/jtreg/compiler/arraycopy/TestCloneAccessStressGCM.java
! test/hotspot/jtreg/compiler/arraycopy/TestEliminateArrayCopy.java
! test/hotspot/jtreg/compiler/arraycopy/TestInstanceCloneAsLoadsStores.java