[foozzie] Fix path to metadata

tools/foozzie/v8_foozzie.py

 #!/usr/bin/env python
 # Copyright 2016 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
 V8 correctness fuzzer launcher script.
 """
 
 import argparse
@@ skipping 61 matching lines @@
 #
 ### Start of configuration %(first_config_label)s:
 %(first_config_output)s
 ### End of configuration %(first_config_label)s
 #
 ### Start of configuration %(second_config_label)s:
 %(second_config_output)s
 ### End of configuration %(second_config_label)s
 """
 
+FUZZ_TEST_RE = re.compile(r'.*fuzz(-\d+\.js)')
 
 def parse_args():
   parser = argparse.ArgumentParser()
   parser.add_argument(
     '--random-seed', type=int, required=True,
     help='random seed passed to both runs')
   parser.add_argument(
       '--first-arch', help='first architecture', default='x64')
   parser.add_argument(
       '--second-arch', help='second architecture', default='x64')
@@ skipping 18 matching lines @@
   assert options.first_arch in SUPPORTED_ARCHS
   assert options.second_arch in SUPPORTED_ARCHS
   assert options.first_config in CONFIGS
   assert options.second_config in CONFIGS
 
   # Ensure we have a test case.
   assert (os.path.exists(options.testcase) and
           os.path.isfile(options.testcase)), (
       'Test case %s doesn\'t exist' % options.testcase)
 
+  # Deduce metadata file name from test case. This also removes
+  # the prefix the test case might get during minimization.
+  suffix = FUZZ_TEST_RE.match(os.path.basename(options.testcase)).group(1)
   options.meta_data_path = os.path.join(
-      os.path.dirname(options.testcase),
-      'meta' + os.path.basename(options.testcase)[len('fuzz'):])
+      os.path.dirname(options.testcase), 'meta' + suffix)
   assert os.path.exists(options.meta_data_path), (
       'Metadata %s doesn\'t exist' % options.meta_data_path)
 
   # Use first d8 as default for second d8.
   options.second_d8 = options.second_d8 or options.first_d8
 
   # Ensure absolute paths.
   if not os.path.isabs(options.first_d8):
     options.first_d8 = os.path.join(BASE_PATH, options.first_d8)
   if not os.path.isabs(options.second_d8):
@@ skipping 133 matching lines @@
         configs='', sources='', suppression='wrong_usage')
     result = RETURN_FAIL
   except Exception as e:
     print FAILURE_HEADER_TEMPLATE % dict(
         configs='', sources='', suppression='internal_error')
     print '# Internal error: %s' % e
     traceback.print_exc(file=sys.stdout)
     result = RETURN_FAIL
 
   sys.exit(result)