[clang] [clang-format] Handle control statements in BreakAfterAttributes (PR #71995)

[Owen Pan via cfe-commits]

================
@@ -1432,34 +1432,82 @@ struct FormatStyle {
     ///   const int i;
     ///   [[gnu::const]] [[maybe_unused]]
     ///   int j;
+    ///
     ///   [[nodiscard]]
     ///   inline int f();
     ///   [[gnu::const]] [[nodiscard]]
     ///   int g();
+    ///
+    ///   [[likely]]
+    ///   if (a)
+    ///     f();
+    ///   else
+    ///     g();
+    ///
+    ///   switch (b) {
+    ///   [[unlikely]]
+    ///   case 1:
+    ///     ++b;
+    ///     break;
+    ///   [[likely]]
+    ///   default:
+    ///     return;
+    ///   }
     /// \endcode
     ABS_Always,
     /// Leave the line breaking after attributes as is.
     /// \code
     ///   [[maybe_unused]] const int i;
     ///   [[gnu::const]] [[maybe_unused]]
     ///   int j;
+    ///
     ///   [[nodiscard]] inline int f();
     ///   [[gnu::const]] [[nodiscard]]
     ///   int g();
+    ///
+    ///   [[likely]] if (a)
+    ///     f();
+    ///   else
+    ///     g();
+    ///
+    ///   switch (b) {
+    ///   [[unlikely]] case 1:
+    ///     ++b;
+    ///     break;
+    ///   [[likely]]
+    ///   default:
+    ///     return;
+    ///   }
     /// \endcode
     ABS_Leave,
     /// Never break after attributes.
     /// \code
     ///   [[maybe_unused]] const int i;
     ///   [[gnu::const]] [[maybe_unused]] int j;
+    ///
     ///   [[nodiscard]] inline int f();
     ///   [[gnu::const]] [[nodiscard]] int g();
+    ///
+    ///   [[likely]] if (a)
+    ///     f();
+    ///   else
+    ///     g();
+    ///
+    ///   switch (b) {
+    ///   [[unlikely]] case 1:
+    ///     ++b;
+    ///     break;
+    ///   [[likely]] default:
+    ///     return;
+    ///   }
     /// \endcode
     ABS_Never,
   };
 
-  /// Break after a group of C++11 attributes before a variable/function
-  /// (including constructor/destructor) declaration/definition name.
+  /// Break after a group of C++11 attributes before variable or function
+  /// (including constructor/destructor) declaration/definition names or before
+  /// control statements, i.e. ``if``, ``switch`` (including ``case`` and
+  /// ``default``labels), ``for``, and ``while`` statements.
----------------
owenca wrote:

```suggestion
  /// ``default`` labels), ``for``, and ``while`` statements.
```

https://github.com/llvm/llvm-project/pull/71995