support .class guard (IDEA-169707)

java/java-tests/testData/inspection/guarded/staticSyncOnClass.java

@@ -0,0 +1,10 @@
+import javax.annotation.concurrent.GuardedBy;
+
+class GuardedByDemo {
+  @GuardedBy("GuardedByDemo.class")
+  static final long foo = 23;
+
+  synchronized static void bar() {
+    long a = foo;
+  }
+}