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

compiler/testData/diagnostics/tests/exposed/simple.fir.kt

@@ -0,0 +1,23 @@
+private interface My
+
+private open class Base
+
+public interface Your: My {
+    fun <T: Base> foo(): T
+}
+
+public class Derived<T: My>(val x: My): Base() {
+
+    constructor(xx: My?, x: My): this(xx ?: x)
+
+    val y: Base? = null
+
+    val My.z: Int
+        get() = 42
+
+    fun foo(m: My): My = m
+
+    fun My.bar(): My = this
+}
+
+