hg: jdk/jdk: 8241427: Coarsen locking in Modules::add_module_exports

[claes.redestad at oracle.com]

Changeset: 7e710082a8aa
Author:    redestad
Date:      2020-03-26 00:02 +0100
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/7e710082a8aa

8241427: Coarsen locking in Modules::add_module_exports
Reviewed-by: lfoltan, hseigel

! src/hotspot/share/classfile/modules.cpp
! src/hotspot/share/classfile/modules.hpp
! src/hotspot/share/classfile/packageEntry.cpp
! src/hotspot/share/classfile/systemDictionary.cpp
! test/hotspot/jtreg/runtime/modules/AccessCheckAllUnnamed.java
! test/hotspot/jtreg/runtime/modules/JVMAddModuleExportsToAll.java