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

compiler/testData/diagnostics/tests/callableReference/resolve/moreSpecificSimple.fir.kt

@@ -0,0 +1,12 @@
+// !CHECK_TYPE
+
+interface IA
+interface IB : IA
+
+fun IA.extFun() {}
+fun IB.extFun() {}
+
+fun test() {
+    val extFun = <!UNRESOLVED_REFERENCE!>IB::extFun<!>
+    <!INAPPLICABLE_CANDIDATE!>checkSubtype<!><IB.() -> Unit>(extFun)
+}