git: openjdk/jcstress: Refactor IRIW tests a bit

[duke]

Changeset: d82f751e
Author:    Aleksey Shipilëv <shade at redhat.com>
Committer: GitHub <noreply at github.com>
Date:      2021-03-23 16:29:27 +0000
URL:       https://git.openjdk.java.net/jcstress/commit/d82f751e

Refactor IRIW tests a bit


- tests-custom/src/main/java/org/openjdk/jcstress/tests/volatiles/IRIWTest.java
+ tests-custom/src/main/java/org/openjdk/jcstress/tests/volatiles/OpaqueIRIWTest.java
+ tests-custom/src/main/java/org/openjdk/jcstress/tests/volatiles/RelaxedIRIWTest.java
! tests-custom/src/main/java/org/openjdk/jcstress/tests/volatiles/VolatileIRIWTest.java