Generate foreign annotation test data for FIR

compiler/testData/diagnostics/foreignAnnotationsTests/tests/rxjava3Errors.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // NULLABILITY_ANNOTATIONS: @io.reactivex.rxjava3.annotations:strict
 
 // FILE: A.java
@@ -40,4 +41,4 @@ fun main(a: A<String>, a1: A<String?>) {
 
     a1.baz("")!!.length
     a1.baz(<!NULL_FOR_NONNULL_TYPE!>null<!>)!!.length
-}
+}