hg: tsan/dev: Instrument unsafe volatile memory accesses

[aeubanks at google.com]

Changeset: 0ba46d34c0be
Author:    aeubanks
Date:      2019-09-20 08:33 -0700
URL:       https://hg.openjdk.java.net/tsan/dev/rev/0ba46d34c0be

Instrument unsafe volatile memory accesses

! src/hotspot/share/prims/unsafe.cpp
! test/hotspot/jtreg/tsan/AbstractLoop.java
+ test/hotspot/jtreg/tsan/NonRacyUnsafeVolatileLoopTest.java
+ test/hotspot/jtreg/tsan/NonRacyVolatileLoopTest.java