hg: tsan/dev: Instrument Unsafe CAS

[aeubanks at google.com]

Changeset: 78018a0c84f8
Author:    aeubanks
Date:      2019-09-23 12:35 -0700
URL:       https://hg.openjdk.java.net/tsan/dev/rev/78018a0c84f8

Instrument Unsafe CAS

! src/hotspot/share/prims/unsafe.cpp
+ test/hotspot/jtreg/tsan/NonRacyCasLoopTest.java