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

compiler/testData/diagnostics/tests/smartCasts/intersectionScope/mostSpecific.fir.kt

@@ -0,0 +1,19 @@
+// !CHECK_TYPE
+
+interface Common {
+    fun foo(): CharSequence?
+}
+
+interface A : Common {
+    override fun foo(): CharSequence
+}
+
+interface B : Common {
+    override fun foo(): String
+}
+
+fun test(c: Common) {
+    if (c is B && c is A) {
+        c.<!AMBIGUITY!>foo<!>().<!INAPPLICABLE_CANDIDATE!>checkType<!> { <!UNRESOLVED_REFERENCE!>_<!><String>() }
+    }
+}