Add support for noalias function parameters

[GuillaumeGomez]

No description provided.

[GuillaumeGomez]

We figured out where the bug was coming from: it's because of ByValue arguments. It can be reproduced with this code:

use std::mem;

#[repr(C)]
pub struct Buffer {
    data: *mut u8,
    len: usize,
    drop: extern "C" fn(Buffer),
}

impl Default for Buffer {
    #[inline]
    fn default() -> Self {
        Self::from(vec![])
    }
}

impl Buffer {
    #[inline]
    pub fn new() -> Self {
        Self::default()
    }

    #[inline]
    pub fn push(&mut self, v: u8) {
    }
}

impl From<Vec<u8>> for Buffer {
    fn from(mut v: Vec<u8>) -> Self {
        let (data, len) = (v.as_mut_ptr(), v.len());
        mem::forget(v);

        extern "C" fn drop(b: Buffer) {
        }

        Buffer { data, len, drop }
    }
}

fn main() {
    let mut buffer = Buffer::new();
}