Add json fuzzer

test/fuzzer/regexp.cc

 // 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.
 
+#include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 
 #include "include/v8.h"
 #include "src/factory.h"
 #include "src/objects-inl.h"
 #include "src/objects.h"
 #include "src/regexp/jsregexp.h"
 #include "test/fuzzer/fuzzer-support.h"
 
@@ skipping 40 matching lines @@
     i::MaybeHandle<i::JSRegExp> maybe_regexp =
         i::JSRegExp::New(source, static_cast<i::JSRegExp::Flags>(flags));
     i::Handle<i::JSRegExp> regexp;
     if (!maybe_regexp.ToHandle(&regexp)) continue;
     USE(i::RegExpImpl::Exec(regexp, one_byte, 0, results_array).is_null() &&
         i::RegExpImpl::Exec(regexp, two_byte, 0, results_array).is_null());
   }
 
   return 0;
 }