[regexp, fuzzer] improve regexp fuzzer coverage.

test/fuzzer/testcfg.py

 # 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.
 
 import os
 
 from testrunner.local import testsuite
 from testrunner.objects import testcase
 
 
+class FuzzerVariantGenerator(testsuite.VariantGenerator):
+  # Only run the fuzzer with standard variant.
+  def FilterVariantsByTest(self, testcase):
+    return self.standard_variant
+
+  def GetFlagSets(self, testcase, variant):
+    return testsuite.FAST_VARIANT_FLAGS[variant]
+
+
 class FuzzerTestSuite(testsuite.TestSuite):
   SUB_TESTS = ( 'parser', 'regexp', )
 
   def __init__(self, name, root):
     super(FuzzerTestSuite, self).__init__(name, root)
 
   def ListTests(self, context):
     tests = []
     for subtest in FuzzerTestSuite.SUB_TESTS:
       shell = '%s_fuzzer' % subtest
       for fname in os.listdir(os.path.join(self.root, subtest)):
         if not os.path.isfile(os.path.join(self.root, subtest, fname)):
           continue
         test = testcase.TestCase(self, '%s/%s' % (subtest, fname),
                                  override_shell=shell)
         tests.append(test)
     tests.sort()
     return tests
 
   def GetFlagsForTestCase(self, testcase, context):
     suite, name = testcase.path.split('/')
     return [os.path.join(self.root, suite, name)]
 
+  def _VariantGeneratorFactory(self):
+    return FuzzerVariantGenerator
+
 
 def GetSuite(name, root):
   return FuzzerTestSuite(name, root)