Patch V8 API to be ABI compatible with v5.9.

[MylesBorins]

This is a patch to make V8 5.8 ABI compatible with V8 5.9

I did not include a patch to bump the NODE_MODULES version. Do we plan to bump it for each ABI change prior to release?

V8-CI: https://ci.nodejs.org/job/node-test-commit-v8-linux/690/

CI: https://ci.nodejs.org/job/node-test-pull-request/7926/

[addaleax]

Comparing with my own attempt in #12875, this is missing:

• c107737 – fixes API, not ABI, breakage, and includes a deprecation that we probably want
• 01605c0 – ABI breakage, that was just overlooked I guess?
• 2f6c4bd – as long as we consider deprecations API breakage, this is needed
• ac5c950 – also ABI breakage that seems to have been overlooked in this patch?

I would say that this patch has a somewhat more elegant solution for the changed value of kJSApiObjectType, but other than that #12875 seems more complete right now.

[MylesBorins]

hey @addaleax didn't see your original patch. Want me to close this?

[addaleax]

@MylesBorins I don’t really care that much… If you want, feel free to cherry-pick the changes listed above (plus 932bd46 and maybe cbf3ecf) to this PR and I’ll close mine. ¯\_(ツ)_/¯

[MylesBorins]

Closing in favor of #12875