KT-42909 fix missing loop variable in 'withIndex' ranges

compiler/testData/codegen/box/ranges/forInProgressionWithIndex/kt42909.kt

@@ -0,0 +1,16 @@
+// WITH_RUNTIME
+// KJS_WITH_FULL_RUNTIME
+
+fun box(): String {
+    var r = test()
+    if (r != "01") throw AssertionError(r.toString())
+    return "OK"
+}
+
+private fun test(): String {
+    var r = ""
+    for ((i, _) in (1..'c' - 'a').withIndex()) {
+        r += i.toString()
+    }
+    return r
+}