[clang] Turn `-Wdeprecated-literal-operator` on by default (PR #111027)

[Aaron Ballman via cfe-commits]

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

LGTM, please keep an eye out for fallout in the wild though. It may be interesting to see how many instances of `-Wno-deprecated-literal-operator` exist now and do a search again before release to see how many new instances show up.

https://github.com/llvm/llvm-project/pull/111027