test: move test-vm-function-redefinition to parallel

With the upstream fix in V8, function declarations now
work fine in the vm module and the test is no longer failing.

Fixes: #548
Refs: https://codereview.chromium.org/2334733002
Refs: #9618

PR-URL: #11029
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Myles Borins <myles.borins@gmail.com>

Author: fhinkel