- Return empty handles instead of exceptions.
- Handlify functions instead of returning raw pointers.

Bug: v8:5751
Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Change-Id: I28b018e5bdcaa375748eb04e9a6fed8cf64a5b05
Reviewed-on: https://chromium-review.googlesource.com/1148301
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54675}