Enable attribute macro expansion in analysis-stats
Before:
```
> $ rust-analyzer -q analysis-stats --with-proc-macro --load-output-dirs .
Database loaded: 19.08s, 277minstr
crates: 34, mods: 688, decls: 13202, fns: 10412
Item Collection: 16.21s, 76ginstr
exprs: 290580, ??ty: 2508 (0%), ?ty: 1814 (0%), !ty: 947
Inference: 27.46s, 108ginstr
Total: 43.67s, 184ginstr
```
After:
```
> $ ./target/release/rust-analyzer -q analysis-stats --with-proc-macro --load-output-dirs .
Database loaded: 1.09s, 277minstr
crates: 34, mods: 688, decls: 14790, fns: 11006
Item Collection: 18.20s, 78ginstr
exprs: 297826, ??ty: 493 (0%), ?ty: 558 (0%), !ty: 342
Inference: 28.34s, 111ginstr
Total: 46.54s, 190ginstr
```
d174b919dc