JS: move expressions test to box tests

js/js.translator/testData/box/expression/identifierClash/overloadedFun.kt

@@ -0,0 +1,21 @@
+package foo
+
+abstract class B {
+    abstract fun foo(param: String): String
+}
+
+class A : B() {
+    // must be here - before open fun foo(String)
+    private fun foo(param: Int) = "foo(Int)"
+
+    fun foo() = "foo()"
+
+    override fun foo(param: String) = "foo(String)"
+}
+
+fun box(): String {
+    val result = A().foo("OK")
+    if (result != "foo(String)") return "fail: $result"
+
+    return "OK"
+}