hg: jdk/jdk: 8223177: Data race on JvmtiEnvBase::_tag_map in double-checked locking

[manc at google.com]

Changeset: 27c8a2e0b0e5
Author:    manc
Date:      2019-04-30 18:44 -0700
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/27c8a2e0b0e5

8223177: Data race on JvmtiEnvBase::_tag_map in double-checked locking
Summary: Add memory fences on accesses to JvmtiEnvBase::_tag_map
Reviewed-by: dholmes, jcbeyler, sspitsyn

! src/hotspot/share/prims/jvmtiEnvBase.hpp
! src/hotspot/share/prims/jvmtiTagMap.cpp