Add early exit on EOS to lexer.

src/lexer/lexer.gyp

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 48 matching lines @@
       'actions': [
         {
           'action_name': 're2c',
           'inputs': [
             '../../src/lexer/lexer.re',
           ],
           'outputs': [
             '<(SHARED_INTERMEDIATE_DIR)/lexer.cc',
           ],
           'action': [
-            '$(RE2C)',
+            're2c',
             '-f',
             '-c',
             '--output',
             '<(SHARED_INTERMEDIATE_DIR)/lexer.cc',
             '../../src/lexer/lexer.re',
           ],
         },
       ],
     },
   ],
 }