hg: jdk8u/jdk8u-dev/hotspot: 8248214: Add paddings for TaskQueueSuper to reduce false-sharing cache contention

[zgu at redhat.com]

Changeset: d8f1fd8de0a9
Author:    qpzhang
Date:      2020-06-16 23:15 +0800
URL:       https://hg.openjdk.java.net/jdk8u/jdk8u-dev/hotspot/rev/d8f1fd8de0a9

8248214: Add paddings for TaskQueueSuper to reduce false-sharing cache contention
Summary: This is a downport of a part of JDK-8243326
Reviewed-by: goetz, clanger

! src/share/vm/memory/padded.hpp
! src/share/vm/utilities/taskqueue.hpp