deps: V8: fix bug in InternalPerformPromiseThen

This fix never landed upstream as it was not longer relevant to active
V8 branches for Chromium.

Original commit message:
  [turbofan] Fix bug in InternalPerformPromiseThen

  Bug: chromium:831170
  Change-Id: I1022fc360aafdfd392d6781eb50afc87a18096fd

PR-URL: https://github.com/nodejs/node/pull/21426


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>