Move ir box test under "box/ir"

compiler/testData/codegen/box/ir/primitiveNumberComparisons/comparableToDouble.kt

@@ -0,0 +1,15 @@
+fun ltDD(x: Comparable<Double>, y: Double) =
+    x is Double && x < y
+
+fun ltCD(x: Comparable<Double>, y: Double) =
+    x < y
+
+fun box(): String {
+    val Z = 0.0
+    val NZ = -0.0
+
+    if (ltDD(NZ, Z)) return "Fail 1"
+    if (!ltCD(NZ, Z)) return "Fail 2"
+
+    return "OK"
+}