Hir debug view drops precedence `as` and `&mut`

[A4-Tacks]

rust-analyzer version: rust-analyzer 1.77.0-nightly (bf8716f1 2023-12-24)

rustc version: rustc 1.77.0-nightly (bf8716f1c 2023-12-24)

relevant settings: NONE

repository link (if public, optional): NONE

code snippet to reproduce:

fn main() {
    let r = &2;
    let _ = &mut (*r as i32);
}

view Hir output:

fn main() {
    let r = &2;
    let _ = &mut *r as i32;
}

&mut *r as i32 is (&mut *r) as i32 (in rust syntax)

[Veykril]

HIR doesn't have the concept of parenthesized expressions, so the debug rendering doesn't show that either (the precedence is still there due to the tree hiarchy). We could fix that but the HIR view command is just a debug utility.