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

^KT-61983 Fixed

compiler/testData/ir/irText/classes/inlineClass.kt.txt

@@ -21,9 +21,9 @@ value class Test {
     when {
       other !is Test -> return false
     }
-    val tmp0_other_with_cast: Test = other as Test
+    val tmp_0: Test = other as Test
     when {
-      EQEQ(arg0 = <this>.#x, arg1 = tmp0_other_with_cast.#x).not() -> return false
+      EQEQ(arg0 = <this>.#x, arg1 = tmp_0.#x).not() -> return false
     }
     return true
   }