Build failure on SmartOS

[targos]

CI: https://ci.nodejs.org/job/node-test-commit-smartos/22671/nodes=smartos17-64/console

19:30:19 dtrace: failed to compile script src/v8ustack.d: line 378: failed to resolve V8DBG_CLASS_JSFUNCTION__SHARED__SHAREDFUNCTIONINFO: Unknown variable name

[cjihrig]

Will look into this.

[cjihrig]

So, this isn't a SmartOS issue. The postmortem debugging metadata was pretty broken in V8. This should be fixed by #96, although the first commit there needs to be upstreamed.

EDIT: V8 changes upstreamed at https://chromium-review.googlesource.com/c/v8/v8/+/1392449