[clang-reorder-fields] Handle macros fields declarations. (#118005)

Right now fields with macro declarations break the tool:

```

struct Foo {
Mutex mu;
int x GUARDED_BY(mu);
int y;
}

[clang-reorder-fields] Handle macros fields declarations. (#118005)

Right now fields with macro declarations break the tool:

```

struct Foo {
Mutex mu;
int x GUARDED_BY(mu);
int y;
};
```

reordered by mu,y,x yields:

```
struct Foo {
Mutex mu;
int y GUARDED_BY(mu);
int x;
};
```

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