git: openjdk/jdk18: 8278389: SuspendibleThreadSet::_suspend_all should be volatile/atomic

[Thomas Schatzl]

Changeset: aec1b039
Author:    Thomas Schatzl <tschatzl at openjdk.org>
Date:      2021-12-16 12:29:57 +0000
URL:       https://git.openjdk.java.net/jdk18/commit/aec1b039b35b73db17c943cdd86949a92e64fcb6

8278389: SuspendibleThreadSet::_suspend_all should be volatile/atomic

Reviewed-by: ayang, mli

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