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

compiler/testData/diagnostics/tests/callableReference/function/ambiguityTopLevelVsTopLevel.fir.kt

@@ -0,0 +1,9 @@
+// !DIAGNOSTICS: -UNUSED_EXPRESSION,-UNUSED_VARIABLE
+fun foo(x: Int, y: Any) = x
+fun foo(x: Any, y: Int) = y
+
+fun main() {
+    <!UNRESOLVED_REFERENCE!>::foo<!>
+    
+    val fooRef: (Int, Any) -> Unit = <!UNRESOLVED_REFERENCE!>::foo<!>
+}