[clang] [UBSAN] [NFC] resolve clang-format errors (PR #175716)

[Hubert Tong via cfe-commits]

https://github.com/hubert-reinterpretcast approved this pull request.

LGTM!

Confirmed that the content is identical to running
```
clang-format -i CGClass.cpp CGExprAgg.cpp CGExprCXX.cpp
```
on commit dc1a886fb9df in `main`.

https://github.com/llvm/llvm-project/pull/175716