[libc-commits] [libc] [libc] Add regex AST and ExprPool (PR #198728)

[Alexey Samsonov via libc-commits]

https://github.com/vonosmas approved this pull request.

LGTM! I have a few nits/suggestions, all small enough not necessitating another round from me.

https://github.com/llvm/llvm-project/pull/198728