[clang] [clang-format] Add KwBreakBeforeCaseLabel (PR #227668)

[Björn Schäpers via cfe-commits]

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@@ -281,6 +281,14 @@ class LineJoiner {
         return MergedLines;
     }
 
+    // Handle case labels preceded by a break statement
+    if (Style.KwBreakBeforeCaseLabel &&
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HazardyKnusperkeks wrote:

Instead of joining lines, how about `ContinuationIndenter::canBreak` returning `false` in your case.?

https://github.com/llvm/llvm-project/pull/227668