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

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

@@ -0,0 +1,10 @@
+import java.util.concurrent.atomic.AtomicLongFieldUpdater;
+
+class Atomics {
+  private volatile long num;
+
+  public void set(long n) {
+    AtomicLongFieldUpdater<Atomics> updater = AtomicLongFieldUpdater.newUpdater(Atomics.class, "num");
+    updater.set(this, n);
+  }
+}