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

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owenca wrote:

There's still a remaining issue related to https://github.com/llvm/llvm-project/pull/154580#issuecomment-3227597240.

.clang-format:
```
AllowShortBlocksOnASingleLine: Always
AllowShortRecordOnASingleLine: Never
BreakBeforeBraces: Custom
BraceWrapping:
  AfterClass: true
```

Expected:
```
class foo
{ int i; };
```

Actual:
```
class foo
{
  int i;
};
```

Should we merge this patch and fix the issue in another patch? @HazardyKnusperkeks @mydeveloperday

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