[IR] dumpKotlinLike: add testdata for FIR tests

compiler/testData/ir/irText/expressions/smartCastsWithDestructuring.fir.kt.txt

@@ -0,0 +1,24 @@
+interface I1 {
+
+}
+
+interface I2 {
+
+}
+
+operator fun I1.component1(): Int {
+  return 1
+}
+
+operator fun I2.component2(): String {
+  return ""
+}
+
+fun test(x: I1) {
+  when {
+    x !is I2 -> return Unit
+  }
+  val <destruct>: I2 = x /*as I2 */
+  val c1: Int = <destruct>.component1()
+  val c2: String = <destruct>.component2()
+}