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

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================
@@ -957,15 +958,20 @@ static bool ShouldBreakBeforeBrace(const FormatStyle &Style,
   if (InitialToken.is(TT_NamespaceMacro))
     Kind = tok::kw_namespace;
 
+  const bool WrapRecordAllowed =
+      !IsEmptyBlock ||
+      Style.AllowShortRecordOnASingleLine < FormatStyle::SRS_Empty ||
+      Style.BraceWrapping.SplitEmptyRecord;
----------------
owenca wrote:

Can you explain?

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