[JS IR BE] Fix overriding property of Throwable

js/js.translator/testData/box/expression/try/overrideThrowableProperties.kt

@@ -0,0 +1,21 @@
+// EXPECTED_REACHABLE_NODES: 1315
+
+open class Ex0(msg: String, cs: Throwable): Throwable(msg, cs)
+
+class Ex1: Ex0("A", Error("fail2")) {
+    override val cause = Error("B")
+}
+
+class Ex2: Ex0("fail3", Error("C")) {
+    override val message = "D"
+}
+
+fun box(): String {
+    val ex1: Throwable = Ex1()
+    val ex2: Throwable = Ex2()
+
+    val r = ex1.message + ex1.cause?.message + ex2.cause?.message + ex2.message
+    if (r != "ABCD") return "Fail: $r"
+
+    return "OK"
+}