KT-2752: add basic tests for JsName

js/js.translator/testData/box/jsName/secondaryConstructor.kt

@@ -0,0 +1,15 @@
+package foo
+
+class A(val x: String) {
+    @JsName("A_int") constructor(x: Int) : this("int $x")
+}
+
+fun test() = js("""
+return Kotlin.modules.JS_TESTS.foo.A_int(23).x;
+""")
+
+fun box(): String {
+    val result = test()
+    assertEquals("int 23", result);
+    return "OK"
+}