hg: tsan/dev: Add test which does synchronization in native land

[aeubanks at google.com]

Changeset: bc4100503ba4
Author:    aeubanks
Date:      2019-04-22 15:03 -0700
URL:       http://hg.openjdk.java.net/tsan/dev/rev/bc4100503ba4

Add test which does synchronization in native land

! test/hotspot/jtreg/tsan/AbstractNativeLoop.java
+ test/hotspot/jtreg/tsan/NonRacyNativeLoopNativeSyncTest.java
! test/hotspot/jtreg/tsan/libAbstractNativeLoop.c