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

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================
@@ -574,6 +580,82 @@ class LineJoiner {
     return 0;
   }
 
+  unsigned tryMergeRecord(ArrayRef<AnnotatedLine *>::const_iterator I,
+                          ArrayRef<AnnotatedLine *>::const_iterator E,
+                          unsigned Limit) {
+    const auto *Line = I[0];
+    const auto *NextLine = I[1];
+
+    auto GetRelevantAfterOption = [&](const FormatToken *Tok) {
+      switch (Tok->getType()) {
+      case TT_StructLBrace:
+        return Style.BraceWrapping.AfterStruct;
+      case TT_ClassLBrace:
+        return Style.BraceWrapping.AfterClass;
+      case TT_UnionLBrace:
+        return Style.BraceWrapping.AfterUnion;
+      default:
+        return false;
+      };
+    };
+
+    // Current line begins both record and block, brace was not wrapped.
+    if (Line->Last->isOneOf(TT_StructLBrace, TT_ClassLBrace, TT_UnionLBrace)) {
----------------
owenca wrote:

```suggestion
    // Current line begins both record and block, brace was not wrapped.
    if (Line->Last->isOneOf(TT_ClassLBrace, TT_StructLBrace, TT_UnionLBrace)) {
      auto WrapLBrace = [&](TokenType LBraceType) {
        switch (LBraceType) {
        case TT_ClassLBrace:
          return Style.BraceWrapping.AfterClass;
        case TT_StructLBrace:
          return Style.BraceWrapping.AfterStruct;
        case TT_UnionLBrace:
          return Style.BraceWrapping.AfterUnion;
        default:
          return false;
        };
      };
```

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