[clang] clang-format: Add "AllowShortNamespacesOnASingleLine" option (PR #105597)

[Björn Schäpers via cfe-commits]

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@@ -916,6 +981,23 @@ class LineJoiner {
     return 1 + I[1]->Last->TotalLength + 1 + I[2]->Last->TotalLength <= Limit;
   }
 
+  bool nextNLinesFitInto(SmallVectorImpl<AnnotatedLine *>::const_iterator I,
+                         SmallVectorImpl<AnnotatedLine *>::const_iterator E,
+                         unsigned Limit) {
+    unsigned joinedLength = 0;
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HazardyKnusperkeks wrote:

```suggestion
    unsigned JoinedLength = 0;
```

https://github.com/llvm/llvm-project/pull/105597