JVM_IR KT-48640 generate for-in-downTo as a counter loop

compiler/testData/codegen/box/ranges/forInDownTo/forInDownToWithPossibleUnderflow.kt

@@ -0,0 +1,72 @@
+// WITH_RUNTIME
+
+const val MB = Byte.MIN_VALUE
+const val MS = Short.MIN_VALUE
+const val MI = Int.MIN_VALUE
+const val ML = Long.MIN_VALUE
+const val MC = Char.MIN_VALUE
+
+fun testByte() {
+    var s = ""
+    var t = 0
+    for (i in MB + 1 downTo MB) {
+        ++t
+        s += i
+        if (t > 2) throw Exception("too many iterations: $t")
+    }
+    if (s != "-127-128") throw Exception(s)
+}
+
+fun testShort() {
+    var s = ""
+    var t = 0
+    for (i in MS + 1 downTo MS) {
+        ++t
+        s += i
+        if (t > 2) throw Exception("too many iterations: $t")
+    }
+    if (s != "-32767-32768") throw Exception(s)
+}
+
+fun testInt() {
+    var s = ""
+    var t = 0
+    for (i in MI + 1 downTo MI) {
+        ++t
+        s += i
+        if (t > 2) throw Exception("too many iterations: $t")
+    }
+    if (s != "-2147483647-2147483648") throw Exception(s)
+}
+
+fun testLong() {
+    var s = ""
+    var t = 0
+    for (i in ML + 1L downTo ML) {
+        ++t
+        s += i
+        if (t > 2) throw Exception("too many iterations: $t")
+    }
+    if (s != "-9223372036854775807-9223372036854775808") throw Exception(s)
+}
+
+fun testChar() {
+    var s = ""
+    var t = 0
+    for (i in (MC.toInt() + 1).toChar() downTo MC) {
+        ++t
+        s += i.toInt()
+        if (t > 2) throw Exception("too many iterations: $t")
+    }
+    if (s != "10") throw Exception(s)
+}
+
+fun box(): String {
+    testByte()
+    testShort()
+    testInt()
+    testLong()
+    testChar()
+
+    return "OK"
+}