KT-2752: add checkers for inconsistent usage of JsName

js/js.translator/testData/box/nameClashes/methodAndPrivateProperty.kt

@@ -0,0 +1,12 @@
+package foo
+
+fun bar() = 23
+
+private val bar = 32
+
+fun box(): String {
+    assertEquals(23, bar())
+    assertEquals(32, bar)
+
+    return "OK"
+}