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

compiler/testData/diagnostics/tests/operatorsOverloading/compareToNullable.fir.kt

@@ -0,0 +1,12 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+class C {
+    operator fun compareTo(c: C): Int? = null
+}
+
+fun test(c: C) {
+    c < c
+    c <= c
+    c >= c
+    c > c
+}