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

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

@@ -0,0 +1,11 @@
+import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
+
+class Atomics {
+  private volatile String <warning descr="Private field 'str' is never assigned">str</warning>;
+  private static final AtomicReferenceFieldUpdater<Atomics, String> updater =
+    AtomicReferenceFieldUpdater.newUpdater(Atomics.class, String.class, "str");
+
+  public String getStr() {
+    return updater.get(this);
+  }
+}