v8: backport header diff from 2e4a68733803

Backport API-incompatible changes from
2e4a68733803 (“[v8] v8::StackTrace::AsArray returns correct array”).

Ref: https://codereview.chromium.org/2806373005
Ref: https://github.com/v8/v8/2e4a68733803

PR-URL: https://github.com/nodejs/node/pull/12875


Reviewed-By: James M Snell <jasnell@gmail.com>