KT-5044 code cleanup, test added

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

@@ -0,0 +1,26 @@
+// WITH_RUNTIME
+
+fun check(x: Any?): Boolean {
+    if (x is Int) {
+        return x in 239..240
+    }
+
+    throw java.lang.AssertionError()
+}
+
+fun check(x: Any?, l: Any?, r: Any?): Boolean {
+    if (x is Int && l is Int && r is Int) {
+       return x in l..r
+    }
+
+    throw java.lang.AssertionError()
+}
+
+
+fun box(): String {
+    assert(check(239))
+    assert(check(239, 239, 240))
+    assert(!check(238))
+    assert(!check(238, 239, 240))
+    return "OK"
+}