[JS IR] Respect JsExport while assigning stable names

see https://youtrack.jetbrains.com/issue/KT-43404

js/js.translator/testData/box/jsExport/dataClass.kt

@@ -0,0 +1,30 @@
+// MODULE_KIND: COMMON_JS
+// SKIP_MINIFICATION
+
+// FILE: api.kt
+package api
+
+@JsExport
+data class Point(val x: Int, val y: Int) {
+    override fun toString(): String = "[${x}::${y}]"
+}
+
+// we need his class to make sure that there's more than one ping method in existence - due to peculiarities of current namer otherwise test can pass but JsExport won't be actually respected
+data class AltPoint(val x: Int, val y: Int)
+
+// FILE: main.kt
+external interface JsResult {
+    val res: String
+}
+
+@JsModule("lib")
+external fun jsBox(): JsResult
+
+fun box(): String {
+    val res = jsBox().res
+    if (res != "[13::11]") {
+        return "Fail1: ${res}"
+    }
+
+    return "OK"
+}