git: openjdk/jdk17u-dev: 8278389: SuspendibleThreadSet::_suspend_all should be volatile/atomic

[Aleksey Shipilev]

Changeset: a39960a4
Author:    Aleksey Shipilev <shade at openjdk.org>
Date:      2022-01-21 11:04:06 +0000
URL:       https://git.openjdk.java.net/jdk17u-dev/commit/a39960a40e2572b75ece52afbb2179e0e7847e75

8278389: SuspendibleThreadSet::_suspend_all should be volatile/atomic

Backport-of: aec1b039b35b73db17c943cdd86949a92e64fcb6

! src/hotspot/share/gc/shared/suspendibleThreadSet.cpp
! src/hotspot/share/gc/shared/suspendibleThreadSet.hpp