JS backend: fix access to enum entries by implicit receiver and explicit this.

js/js.translator/testData/enum/cases/accessing.kt

@@ -0,0 +1,41 @@
+package foo
+
+enum class A {
+    FOO
+
+    BAR : A() {
+        fun explicitFromEntry() = A.FOO
+        //fun byThisFromEntry() = this.FOO
+        fun implicitFromEntry() = FOO
+    }
+
+    fun explicit() = A.FOO
+    fun byThis() = this.FOO
+    fun implicit() = FOO
+}
+
+fun A.extExplicit() = A.FOO
+fun A.extByThis() = this.FOO
+//fun A.extImplicit() = FOO
+
+fun assertEquals<T>(expected: T, actual: T, id: String) {
+    if (expected != actual) throw Exception("Failed on $id, expected = '$expected', actual = '$actual'")
+}
+
+fun box(): String {
+    assertEquals(A.FOO, A.FOO.explicit(), "explicit access")
+    assertEquals(A.FOO, A.FOO.byThis(), "access by this")
+    assertEquals(A.FOO, A.FOO.implicit(), "implicit access")
+
+    assertEquals(A.FOO, A.FOO.explicit(), "explicit access from BAR")
+    // TODO uncoment when KT-4692 will be fixed
+    //assertEquals(A.FOO, A.FOO.byThis(), "access by this from BAR")
+    assertEquals(A.FOO, A.FOO.implicit(), "implicit access from BAR")
+
+    assertEquals(A.FOO, A.FOO.extExplicit(), "explicit access from ext fun")
+    assertEquals(A.FOO, A.FOO.extByThis(), "access by this from ext fun")
+    // TODO uncoment when KT-4692 will be fixed
+    //assertEquals(A.FOO, A.FOO.extImplicit(), "implicit access from ext fun")
+
+    return "OK"
+}