[regexp, fuzzer] improve regexp fuzzer coverage.

test/fuzzer/testcfg.py

Index: test/fuzzer/testcfg.py
diff --git a/test/fuzzer/testcfg.py b/test/fuzzer/testcfg.py
index 1ea93220bd92070469c83b1808d69262819f6b2d..b8c26d053eddae42064ff70b111898a72f2cc164 100644
--- a/test/fuzzer/testcfg.py
+++ b/test/fuzzer/testcfg.py
@@ -8,6 +8,15 @@ 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', )
 
@@ -31,6 +40,9 @@ class FuzzerTestSuite(testsuite.TestSuite):
     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)