KT-2752: fix JsName with explicit use target. Add some tests for JsName with use targets

js/js.translator/testData/box/delegation/jsNamePropertyDelegation.kt

@@ -0,0 +1,25 @@
+package foo
+
+import kotlin.reflect.KProperty
+
+class A {
+    @JsName("xx") val x: Int by B(23)
+
+    @get:JsName("getYY") val y: Int by B(42)
+}
+
+class B(val value: Int) {
+    operator fun getValue(thisRef: Any?, property: KProperty<*>): Int = value
+}
+
+fun box(): String {
+    val a = A()
+    assertEquals(23, a.x)
+    assertEquals(42, a.y)
+
+    val d: dynamic = a
+    assertEquals(23, d.xx)
+    assertEquals(42, d.getYY())
+
+    return "OK"
+}