deps: backport 8d00c2c from v8 upstream

Original commit message:

    Unbreak --gdbjit for embedders.

    Embedders don't use d8.cc.  Move gdbjit initialization to api.cc.

    Review URL: https://codereview.chromium.org/1710253002

Fixes: https://github.com/nodejs/node/issues/2076
PR-URL: https://github.com/nodejs/node/pull/5577


Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>