add test for ReferencesSearch; use standard isReferenceTo() API (which is the same thing for Kotlin but more efficient for non-Kotlin references)

idea/testData/search/references/testParam.kt

@@ -0,0 +1,8 @@
+data class A(val <caret>n: Int, val s: String, val o: Any)
+
+fun test() {
+    val a = A(1, "2", Any())
+    a.n
+    a.component1()
+    val (x, y, z) = a
+}