hg: jdk/sandbox: 8216258: Make FreeIdSet semaphore-based

[chris.hegarty at oracle.com]

Changeset: 771b50dd0b08
Author:    kbarrett
Date:      2019-01-25 00:27 -0500
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/771b50dd0b08

8216258: Make FreeIdSet semaphore-based
Summary: Use semaphore-based blocking and notifying, instead of Mutex.
Reviewed-by: tschatzl, sangheki

! src/hotspot/share/gc/g1/dirtyCardQueue.cpp
! src/hotspot/share/gc/g1/dirtyCardQueue.hpp
+ src/hotspot/share/gc/g1/g1FreeIdSet.cpp
+ src/hotspot/share/gc/g1/g1FreeIdSet.hpp
+ test/hotspot/gtest/gc/g1/test_g1FreeIdSet.cpp