JS: Fix ClassCastException that occurs when 'when' clause has map range #KT-23458 Fixed

js/js.translator/testData/box/expression/when/whenWithMapRangeClause.kt

@@ -0,0 +1,13 @@
+// IGNORE_BACKEND: JS_IR
+// EXPECTED_REACHABLE_NODES: 1096
+
+package foo
+
+fun box(): String {
+    val map = mapOf(1 to "")
+    val i = 1
+    return when (i) {
+        in map -> "OK"
+        else -> "fail"
+    }
+}