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

[Erich Keane via cfe-commits]

erichkeane wrote:

> 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.

Thats a good idea!  I did our initial search:

https://github.com/search?q=Wno-deprecated-literal-operator&type=code

Looks like 63 total files, 285 issues, 127 PRs, 203 commits.

So so far, most projects are fixing them appears.   We can re-do this search at one point.

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