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

compiler/testData/diagnostics/tests/classObjects/companionObjectOfPrivateClassVisibility.fir.kt

@@ -0,0 +1,19 @@
+package test
+
+fun use() {
+    Default.create()
+
+    Explicit.create()
+}
+
+private class Default {
+    companion object {
+        fun create() = Default()
+    }
+}
+
+private class Explicit {
+    private companion object {
+        fun create() = Explicit()
+    }
+}