[libc-commits] [libc] [libc][regex] Add Kleene star and canonical AST normalisation (PR #233980)

[Jeff Bailey via libc-commits]

kaladron wrote:

Test failures are unrelated to this PR and are fixed in https://github.com/llvm/llvm-project/pull/234678.  I'll rebase after approval.

https://github.com/llvm/llvm-project/pull/233980