Maintain proper evaluation order for 'a in x .. y'

As of Kotlin 1.0 and 1.1, expression 'a in x .. y' is considered
equivalent to 'x.rangeTo(y).a', and should be evaluated in the following
order:
1. x
2. y
3. a
4. compare x with a
5. compare y with a (if needed)

compiler/testData/codegen/box/ranges/contains/evaluationOrderForDownTo.kt

@@ -0,0 +1,31 @@
+// WITH_RUNTIME
+
+val order = StringBuilder()
+
+inline fun expectOrder(at: String, expected: String, body: () -> Unit) {
+    order.setLength(0)
+    body()
+    if (order.toString() != expected) throw AssertionError("$at: expected: $expected, actual: $order")
+}
+
+fun low(i: Int): Int {
+    order.append("L")
+    return i
+}
+
+fun high(i: Int): Int {
+    order.append("H")
+    return i
+}
+
+fun x(i: Int): Int {
+    order.append("X")
+    return i
+}
+
+fun box(): String {
+    expectOrder("0 in 1 .. 3", "HLX") { x(0) in high(3) downTo low(1) }
+    expectOrder("0 !in 1 .. 3", "HLX") { x(0) !in high(3) downTo low(1) }
+
+    return "OK"
+}