find method duplicates: respect varargs mix with constants/params; empty args list (IDEA-56076)

java/java-tests/testData/refactoring/methodDuplicatesMisc/VarargsAccess.java.after

@@ -0,0 +1,14 @@
+class A {
+  {
+      m(new String[0]);
+      m("a");
+      m("a", "b");
+  }
+
+  void m(String... args) {
+    method(1, args);
+  }
+
+  void method(int i, String... args) {
+  }
+}