[JS BE] Fix KT-26787: handle JsSwitch in LabeledBlockToDoWhileTransformation

js/js.translator/testData/box/inline/kt26787.kt

@@ -0,0 +1,34 @@
+// EXPECTED_REACHABLE_NODES: 1618
+
+// Simplified example from https://youtrack.jetbrains.com/issue/KT-26787
+
+enum class Role { PRIMARY, EXTRA }
+
+class Location(val role: Role, val building: Int = 0)
+
+fun box() : String {
+    val result = mutableListOf<Location>()
+
+    val props = arrayOf(
+        Location(Role.PRIMARY),
+        Location(Role.EXTRA),
+        Location(Role.PRIMARY)
+    )
+
+    var loopCount = 0
+    for (possiblyOutdated in props) {
+        when (possiblyOutdated.role) {
+            Role.PRIMARY -> {
+                val index = result.indexOfFirst { it.building == possiblyOutdated.building }
+            }
+            Role.EXTRA -> {
+            }
+        }
+
+        loopCount++
+    }
+
+    if (loopCount != 3) return "Wrong loop count $loopCount"
+
+    return "OK"
+}