[K/JS] Eliminate duplication of init block inside exported ES-classes ^KT-58246 Fixed

js/js.translator/testData/box/export/exportClassWithInitBlock.kt

@@ -0,0 +1,26 @@
+// EXPECTED_REACHABLE_NODES: 1252
+// IGNORE_BACKEND: JS
+// RUN_PLAIN_BOX_FUNCTION
+// INFER_MAIN_MODULE
+
+// KT-58246
+// MODULE: lib
+// FILE: lib.kt
+@JsExport
+var result = 0
+
+@JsExport
+class Test {
+    init {
+        result += 1
+    }
+}
+
+// FILE: test.js
+function box() {
+    new this.lib.Test()
+
+    if (this.lib.result != 1) return "fail (called " + result + " times): init block didn't call or called more than 1 time"
+
+    return "OK"
+}