Basic name poisoning support #4654

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@bricknerb

The following contributors were found for this pull request:

✅ 340dbb1 Author: @bricknerb <br****er@google.com>
✅ a4f8811 Author: @danakj <da***j@orodu.net>
✅ ddc1f3b Author: @zygoloid <ri****d@metafoo.co.uk>
✅ 93b4924 Author: @geoffromer <gr***r@google.com>
✅ b92ee03 Author: @jonmeow <jp****ns@google.com>
✅ 93b4924 Co-Author: @josh11b <josh11b@users.noreply.github.com>, <15258583+josh11b@users.noreply.github.com>
✅ 93b4924 Co-Author: <ch*****rc@gmail.com>
✅ 93b4924 Co-Author: <carbo***********infra@google.com>

(Only the first commit for a unique contributor is listed.)