JVM KT-49548 extra test

compiler/testData/codegen/box/boxingOptimization/kt49548a.kt

@@ -0,0 +1,15 @@
+// WITH_RUNTIME
+
+val p0 = 0..3
+
+fun test(): List<Int> {
+    val progression = if (p0.last != 3) p0 else p0 + 1
+    return progression.map { it }
+}
+
+fun box(): String {
+    val t = test()
+    if (t != listOf(0, 1, 2, 3, 1))
+        return "Failed: t=$t"
+    return "OK"
+}