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

js/js.translator/testData/box/native/jsNamePropertyAccessors.js

@@ -0,0 +1,20 @@
+function A() {
+    this.y_ = 0;
+}
+A.prototype.getX = function() {
+    return 23;
+};
+A.prototype.getY = function() {
+    return this.y_;
+};
+A.prototype.setY = function(y) {
+    return this.y_ = y;
+};
+
+var z_ = 32;
+function getZ() {
+    return z_;
+}
+function setZ(z) {
+    z_ = z;
+}

js/js.translator/testData/box/native/jsNamePropertyAccessors.kt

@@ -0,0 +1,29 @@
+package foo
+
+@native class A {
+    val xx: Int
+        @JsName("getX") get
+
+    var yy: Int
+        @JsName("getY") get
+        @JsName("setY") set
+}
+
+@native var zz: Int
+    @JsName("getZ") get
+    @JsName("setZ") set
+
+fun box(): String {
+    val a = A()
+
+    assertEquals(23, a.xx)
+    assertEquals(0, a.yy)
+    a.yy = 42
+    assertEquals(42, a.yy)
+
+    assertEquals(32, zz)
+    zz = 232
+    assertEquals(232, zz)
+
+    return "OK"
+}