Add test for KT-34902

Author: dnpetrov

compiler/fir/fir2ir/tests/org/jetbrains/kotlin/codegen/ir/FirBlackBoxCodegenTestGenerated.java

@@ -0,0 +1,21 @@
+// KJS_WITH_FULL_RUNTIME
+// WITH_RUNTIME
+
+interface OneofField<T> {
+    val value: T
+    val number: Int
+    val name: String
+
+    data class OneofUint32 constructor(
+        override val value: UInt,
+        override val number: Int = 111,
+        override val name: String = "oneof_uint32"
+    ) : OneofField<UInt>
+}
+
+fun box(): String {
+    val d = OneofField.OneofUint32(0u)
+    val s = d.toString()
+    if (s != "OneofUint32(value=0, number=111, name=oneof_uint32)") return s
+    return "OK"
+}