[FIR-TEST] Add new testdata generated after changes in previous commit

compiler/testData/diagnostics/tests/enum/NonPrivateConstructor.fir.kt

@@ -0,0 +1,7 @@
+enum class E public constructor(val x: Int) {
+    FIRST();
+
+    internal constructor(): this(42)
+
+    constructor(y: Int, z: Int): this(y + z)
+}