[feat] show current function assembly code

[loynoir]

feat

show current function assembly code

description

https://github.com/pacak/cargo-show-asm

Integrate cargo-show-asm into rust-analyzer.

#[inline(never)]
pub fn add42(x: u8) -> u8 {
    let mut a: u8 = x;
    a += 21u8;
    a += 21u8;
    a
}

$ cargo asm --simplify --lib -p cargo_show_asm_example cargo_show_asm_example::add42 2>/dev/null
cargo_show_asm_example::add42:
        lea eax, [rdi + 42]
        ret

[lnicola]

CC #14356