[clang] [clang-format] Support BraceWrapping.AfterNamespace with AllowShortNamespacesOnASingleLine (PR #123010)

[Owen Pan via cfe-commits]

================
@@ -628,28 +632,36 @@ class LineJoiner {
 
   unsigned tryMergeNamespace(ArrayRef<AnnotatedLine *>::const_iterator I,
                              ArrayRef<AnnotatedLine *>::const_iterator E,
-                             unsigned Limit) {
+                             unsigned Limit, bool OpenBraceWrapped) {
----------------
owenca wrote:

```suggestion
                             unsigned Limit) {
```

https://github.com/llvm/llvm-project/pull/123010