[IR] Normalize temp var names in Kotlin-like dump

^KT-61983 Fixed

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

@@ -14,9 +14,9 @@ fun test(x: Any) {
       x is IC1 -> x /*as IC1 */ is IC2
       else -> false
     } -> { // BLOCK
-      val <destruct>: Any = x /*as IC1 */
-      val x1: Int = <destruct> /*as IC1 */.component1()
-      val x2: String = <destruct> /*as IC1 */ /*as IC2 */.component2()
+      val tmp_0: Any = x /*as IC1 */
+      val x1: Int = tmp_0 /*as IC1 */.component1()
+      val x2: String = tmp_0 /*as IC1 */ /*as IC2 */.component2()
     }
   }
 }