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

^KT-61983 Fixed

compiler/testData/ir/irText/classes/dataClasses/delegationInSealed.kt.txt

@@ -52,9 +52,9 @@ sealed class A : CharSequence {
       when {
         other !is B -> return false
       }
-      val tmp0_other_with_cast: B = other as B
+      val tmp_0: B = other as B
       when {
-        EQEQ(arg0 = <this>.#c, arg1 = tmp0_other_with_cast.#c).not() -> return false
+        EQEQ(arg0 = <this>.#c, arg1 = tmp_0.#c).not() -> return false
       }
       return true
     }