[clang] [clang-tools-extra] [Clang] [C2y] Implement N3355 ‘NamedLoops’ (PR #152870)

[Erich Keane via cfe-commits]

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@@ -215,6 +215,8 @@ def warn_c23_compat_case_range : Warning<
   DefaultIgnore, InGroup<CPre2yCompat>;
 def ext_c2y_case_range : Extension<
   "case ranges are a C2y extension">, InGroup<C2y>;
+def err_c2y_labeled_break_continue : Error<
+  "labeled %select{'break'|'continue'}0 is only supported in C2y">;
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erichkeane wrote:

The paper is named `Named loops`, should these be `Named break/continue` (and seems to use 'named' in the paper)?  Kinda applies elsewhere in this patch too.

https://github.com/llvm/llvm-project/pull/152870