Java: Take into account writes to the field done via AtomicFieldUpdater (IDEA-152262)

java/java-tests/testData/codeInsight/atomicReferenceImplicitUsage/ReferenceCAS.java

@@ -0,0 +1,11 @@
+import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
+
+class Atomics {
+  private volatile String str;
+  private static final AtomicReferenceFieldUpdater<Atomics, String> updater =
+    AtomicReferenceFieldUpdater.newUpdater(Atomics.class, String.class, "str");
+
+  public void init(String s) {
+    updater.compareAndSet(this, null, s);
+  }
+}