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

compiler/testData/diagnostics/tests/smartCasts/elvisNothingRHS.fir.kt

@@ -0,0 +1,11 @@
+class C {
+    fun foo() {}
+}
+
+fun test(a: C?, nn: () -> Nothing?) {
+    a ?: nn()
+    a.<!INAPPLICABLE_CANDIDATE!>foo<!>()
+
+    a ?: return
+    a.foo()
+}