KT-10785 Ensure that access to private properties from inside memeber functions of objects is performed via 'this' rather that by FQN.

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/PropertyAccessTest.java

@@ -102,6 +102,10 @@ public final class PropertyAccessTest extends SingleFileTranslationTest {
         checkFooBoxIsOk();
     }
 
+    public void testPrivatePropertyAccessFromMethod() throws Exception {
+        checkFooBoxIsOk();
+    }
+
     @Override
     @NotNull
     protected List<String> additionalJsFiles(@NotNull EcmaVersion ecmaVersion) {

js/js.translator/testData/propertyAccess/cases/privatePropertyAccessFromMethod.kt

@@ -0,0 +1,22 @@
+package foo
+
+object A {
+    private val foo = 23
+
+    fun bar(): Int {
+        // Erase object so that we ensure that access to 'foo' property is performed via 'this'
+        // It's no crucial from runtime standpoind, but JS code looks more concise and natural this way.
+        erase()
+        return foo
+    }
+
+    fun erase() {
+        js("_.foo.A = null")
+    }
+}
+
+fun box(): String {
+    var result = A.bar()
+    if (result != 23) return "failed: ${result}"
+    return "OK"
+}