Need better default values in case clusterfuzz decides to call without params.

ClusterFuzz has detected this issue as fixed in range 43348:43349.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=6033537548681216

Fuzzer: foozzie_js_mutation
Job Type: v8_foozzie
Platform Id: linux

Crash Type: V8 correctness failure
Crash Address: 
Crash State:
  suppression: internal_error
  
Sanitizer: address (ASAN)

Fixed: V8: 43348:43349

Reproducer Testcase: https://cluster-fuzz.appspot.com/download/AMIfv95LCvmzwrh-mJw9cjWOy7PMieJ0mzv0bxIolmIQdI18-OpxLYvFiu-irBSW-p5qFKhKYLp5r-zjOaiv--fAKf-_ACmGI-1qtOq7jw-39jcmYfZ9G6AO-8XSGSejzsSx6TI5F4HePbnRmRneQIiQaT8JjrJxkdXeaMc_jX7MVw_Ev9c_CYXdLZL0cguPYgrODTTKQXOg5T56iDsZg2HUJfrzu4ZjrPHB2eUAlVND3_dEdZdzDLAYl8EQbDqZEta3dtVCENQElcFubSPohdPC1XLk4lC_dG8U8Jz6nV6dCHAH9GI6YUs4jUSMa7lQu0_7KVRF9oZ5Dcl-7cKKA7i3H_m7WUN7lOTgeN1O2KCqAnnwwNtNFF6jn3UaTlxRr6TTk9sQnhAA6uCOveaaI36o9YqPAKLOvQ?testcase_id=6033537548681216


See https://dev.chromium.org/Home/chromium-security/bugs/reproducing-clusterfuzz-bugs for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.