clean up intern tokenization

- moved intern tokenization out of retr_info()
- removed $offset parameter (not anymore necessary)

Change-Id: I063efdee193ab41c2705971a95341573884fd3a2
diff --git a/xt/benchmark.pl b/xt/benchmark.pl
index c1657a6..9d0489a 100644
--- a/xt/benchmark.pl
+++ b/xt/benchmark.pl
@@ -106,14 +106,14 @@
   Dumbbench::Instance::PerlSub->new(
     name => 'Tokenizer-conservative',
     code => sub {
-      $result = $cons_tok->reset->tokenize($t_data, 0);
+      $result = $cons_tok->reset->tokenize($t_data);
       $result = 0;
     }
   ),
   Dumbbench::Instance::PerlSub->new(
     name => 'Tokenizer-aggressive',
     code => sub {
-      $result = $aggr_tok->reset->tokenize($t_data, 0);
+      $result = $aggr_tok->reset->tokenize($t_data);
       $result = 0;
     }
   ),