[ruby/yarp] Ensure newlines are sorted in newline test

https://github.com/ruby/yarp/commit/3bfefc44c4

test/yarp/newline_test.rb

@@ -6,20 +6,6 @@ return unless defined?(RubyVM::InstructionSequence)
 
 module YARP
   class NewlineTest < TestCase
-    class NewlineVisitor < Visitor
-      attr_reader :source, :newlines
-
-      def initialize(source)
-        @source = source
-        @newlines = []
-      end
-
-      def visit(node)
-        newlines << source.line(node.location.start_offset) if node&.newline?
-        super(node)
-      end
-    end
-
     base = File.dirname(__dir__)
     Dir["{lib,test}/**/*.rb", base: base].each do |relative|
       define_method("test_newline_flags_#{relative}") do
@@ -99,7 +85,7 @@ module YARP
         newlines << result.source.line(node.location.start_offset) if node&.newline?
       end
 
-      newlines
+      newlines.sort
     end
   end
 end