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.

Refs: https://codereview.chromium.org/2334733002
Fixes: #548
PR-URL: #9618
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

Author: fhinkel