Regression: false negative in unused_braces lint for braces around macro call

[dtolnay]

#![allow(unreachable_code)]
#![deny(unused_braces)]

fn main() {
    return { println!("!") };
}

$ rustc +nightly-2023-01-14 src/main.rs  # correct behavior
error: unnecessary braces around `return` value
 --> src/main.rs:5:12
  |
5 |     return { println!("!") };
  |            ^^             ^^
  |
note: the lint level is defined here
 --> src/main.rs:2:9
  |
2 | #![deny(unused_braces)]
  |         ^^^^^^^^^^^^^
help: remove these braces
  |
5 -     return { println!("!") };
5 +     return println!("!");
  |

$ rustc +nightly-2023-01-15 src/main.rs  # incorrect: no lint

The false negative bisects to #106866, so pretty obviously #106563. FYI @clubby789 @TaKO8Ki

From skimming #106545, that's an issue about const generics. It doesn't seem like the PR was supposed to have affected unused_braces situations outside of const generics position.