[PATCH] D157606: [C2x] Support -std=c23 and -std=gnu23

[Corentin Jabot via Phabricator via cfe-commits]

cor3ntin added a comment.

`Options.td` defines:
`defvar c2x = LangOpts<"C2x">;`

Does this need change as well?

`UsersManual.rst` also needs an update, but that can be another patch


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D157606/new/

https://reviews.llvm.org/D157606