[clang-format] macro with code block starting on the define

It seems to be impossible (please correct me) to make ``clang-format`` format a macro definition like this:

```c
#define macro { \
int body = 0; \
}
```

No matter what I try, it moves the opening bracket to a new line:
```c
#define macro \
{ \
int body = 0; \
}
```
(One of the variations)

Probably related: https://github.com/llvm/llvm-project/issues/53180

Reproduce the issue with the macro definition shown in the report and compare clang-format's output with the requested layout. Start by tracing the clang-format handling of macro definitions and brace placement; done means the opening brace can remain on the #define line without disrupting the rest of the block.

Written by the indexing model from the issue text.