[clang] [clang-format] Add option AllowShortRecordOnASingleLine (PR #154580)

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https://github.com/owenca commented:

Please don't click `Update branch` or merge `main` branch.

Please add `tok::kw_union` below:
```diff
--- a/clang/lib/Format/UnwrappedLineFormatter.cpp
+++ b/clang/lib/Format/UnwrappedLineFormatter.cpp
@@ -487,7 +487,8 @@ private:
             const FormatToken *PreviousPrevious =
                 Previous->getPreviousNonComment();
             if (PreviousPrevious &&
-                PreviousPrevious->isOneOf(tok::kw_class, tok::kw_struct)) {
+                PreviousPrevious->isOneOf(tok::kw_class, tok::kw_struct,
+                                          tok::kw_union)) {
               return 0;
             }
           }
```

https://github.com/llvm/llvm-project/pull/154580