[clang] [clang-format] allow short function body on a single line (PR #151428)

[Lidong Yan via cfe-commits]

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@@ -878,6 +878,12 @@ struct FormatStyle {
   /// \version 3.5
   ShortFunctionStyle AllowShortFunctionsOnASingleLine;
 
+  /// Dependent on the value, function body like ``{ return 0; }`` can be
+  /// put on a single line. Only when AllowShortFunctionsOnASingleLine = None
+  /// and AllowShortBlocksOnASingleLine != Never, the value of this option
+  /// is true.
+  bool AllowShortFunctionBodiesOnASingleLine;
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brandb97 wrote:

I am not thinking of adding an global option, I will move it to the private area.

https://github.com/llvm/llvm-project/pull/151428