Compute accurate token count when loading from snapshot

runtime/vm/compiler_stats.h

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_COMPILER_STATS_H_
 #define VM_COMPILER_STATS_H_
 
 #include "vm/allocation.h"
 #include "vm/flags.h"
 #include "vm/isolate.h"
@@ skipping 31 matching lines @@
 
   Timer graphoptimizer_timer;  // Included in codegen_timer.
   Timer graphcompiler_timer;   // Included in codegen_timer.
   Timer codefinalizer_timer;   // Included in codegen_timer.
 
   int64_t num_tokens_total;
   int64_t num_literal_tokens_total;
   int64_t num_ident_tokens_total;
   int64_t num_tokens_consumed;
   int64_t num_token_checks;
-  int64_t num_tokens_rewind;
   int64_t num_tokens_lookahead;
 
   int64_t num_classes_compiled;
   int64_t num_functions_compiled;
   int64_t num_implicit_final_getters;
 
   int64_t src_length;          // Total number of characters in source.
   int64_t total_code_size;     // Bytes allocated for code and meta info.
   int64_t total_instr_size;    // Total size of generated code in bytes.
   int64_t pc_desc_size;
   int64_t vardesc_size;
 
   void Print();
 };
 
 #define INC_STAT(isolate, counter, incr)                                       \
   if (FLAG_compiler_stats) { (isolate)->compiler_stats()->counter += (incr); }
 
 #define CSTAT_TIMER_SCOPE(iso, t)                                              \
   TimerScope timer(FLAG_compiler_stats,                                        \
   FLAG_compiler_stats ? &((iso)->compiler_stats()->t) : NULL,                  \
   iso);
 
 }  // namespace dart
 
 #endif  // VM_COMPILER_STATS_H_