function descriptor

Change-Id: I439bac759cb363f35f6aa23a699b6ef1d9079684
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1925027Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#65052}