EarlyOtherwiseBranch transformation is incorrect

[tmiasko]

For details see #77163 (comment), opening an issue since PR was closed:

pub enum E<'a> {
    Empty,
    Some(&'a E<'a>),
}

fn f(e: &E) -> u32 {
   if let E::Some(E::Some(_)) = e { 1 } else { 2 }
}

fn main() {
   println!("{:?}", f(&E::Empty));
}

rustc b.rs -Zmir-opt-level=2 && ./b
"./b" terminated by signal SIGSEGV (Address boundary error)