JS: move expressions test to box tests

js/js.translator/testData/box/expression/evaluationOrder/ifAsPlusArgument.kt

@@ -0,0 +1,10 @@
+package foo
+
+fun box(): String {
+    var  i = 0
+    var t = ++i + if (i == 0) 0 else 2
+    if (t != 3) {
+        return "fail: $t"
+    }
+    return "OK"
+}