[libc-commits] [libc] [libc] Implement iswgraph entrypoint (PR #185339)

[Michael Jones via libc-commits]

https://github.com/michaelrj-google approved this pull request.

LGTM once the merge conflicts are resolved. For the other changes it'd be best to do those in a separate PR.

https://github.com/llvm/llvm-project/pull/185339