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

^KT-61983 Fixed

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

@@ -42,32 +42,32 @@ object X1 {
 
 fun test1(a: IntArray) {
   var i: Int = 0
-  val <array>: IntArray = a
-  val <index_0>: Int = { // BLOCK
-    val <unary>: Int = i
-    i = <unary>.inc()
-    <unary>
+  val tmp_0: IntArray = a
+  val tmp_1: Int = { // BLOCK
+    val tmp_2: Int = i
+    i = tmp_2.inc()
+    tmp_2
   }
-  val <unary>: Int = <array>.get(index = <index_0>)
-  <array>.set(index = <index_0>, value = <unary>.inc())
-  <unary> /*~> Unit */
+  val tmp_3: Int = tmp_0.get(index = tmp_1)
+  tmp_0.set(index = tmp_1, value = tmp_3.inc())
+  tmp_3 /*~> Unit */
 }
 
 fun test2() {
   { // BLOCK
-    val <unary>: Int = X1.<get-x1>()
-    X1.<set-x1>(<set-?> = <unary>.inc())
-    <unary>
+    val tmp_4: Int = X1.<get-x1>()
+    X1.<set-x1>(<set-?> = tmp_4.inc())
+    tmp_4
   } /*~> Unit */
   { // BLOCK
-    val <unary>: Int = X2.<get-x2>()
-    X2.<set-x2>(<set-?> = <unary>.inc())
-    <unary>
+    val tmp_5: Int = X2.<get-x2>()
+    X2.<set-x2>(<set-?> = tmp_5.inc())
+    tmp_5
   } /*~> Unit */
   { // BLOCK
-    val <unary>: Int = X3.<get-x3>()
-    X3.<set-x3>(<set-?> = <unary>.inc())
-    <unary>
+    val tmp_6: Int = X3.<get-x3>()
+    X3.<set-x3>(<set-?> = tmp_6.inc())
+    tmp_6
   } /*~> Unit */
 }