[clang] [clang] Do not serialize function definitions without a body (PR #121550)

[Chuanqi Xu via cfe-commits]

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https://github.com/ChuanqiXu9 approved this pull request.

LGTM now.

We can land this after you fix the formatting issue. I generally use the following command to format my patch:

```
git diff -U0 --no-color --relative HEAD^ | clang/tools/clang-format/clang-format-diff.py -p1 -i
```

feel free to use other methods

https://github.com/llvm/llvm-project/pull/121550