[JS IR BE] Fix and refactor interop tests

js/js.translator/testData/box/expression/evaluationOrder/whenJsLiteralWithSideEffect.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 // EXPECTED_REACHABLE_NODES: 1289
 package foo
 
@@ -11,11 +10,11 @@ fun bar(s: String): Int {
 fun testWhen() {
     global = ""
     when(arrayOf(bar("A"),2,3)) {
-        arrayOf(1) -> println("1")
-        arrayOf(2) -> println("2")
-        else  -> println("else")
+        arrayOf(1) -> bar("1")
+        arrayOf(2) -> bar("2")
+        else  -> bar("else")
     }
-    assertEquals("A", global)
+    assertEquals("Aelse", global)
 
 }