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

compiler/testData/diagnostics/tests/regressions/kt9682.fir.kt

@@ -0,0 +1,28 @@
+// KT-9682 Overload Resolution Ambiguity after casting to Interface
+
+open class Foo {
+    fun bar(): Foo {
+        return this
+    }
+}
+
+class Foo2 : Foo(), IFoo
+
+interface IFoo {
+    fun bar(): Foo
+}
+
+fun test() {
+    val foo : Foo = Foo2()
+    foo as IFoo
+    foo.<!AMBIGUITY!>bar<!>() // Should be resolved to Foo#bar
+}
+
+interface IFoo2 {
+    fun bar(): IFoo2
+}
+
+fun test2(foo: Foo) {
+    foo as IFoo2
+    foo.<!AMBIGUITY!>bar<!>() // should be ambiguity
+}