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

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

@@ -0,0 +1,11 @@
+import java.util.concurrent.atomic.AtomicLongFieldUpdater;
+
+class Atomics {
+  private volatile long num;
+  private static final AtomicLongFieldUpdater<Atomics> updater =
+    (AtomicLongFieldUpdater.newUpdater(Atomics.class, "num"));
+
+  public void init(long n) {
+    updater.compareAndSet(this, 0, n);
+  }
+}