ices/86720.rs: fixed with no errors

[github-actions]

Issue: rust-lang/rust#86720

#![crate_type = "staticlib"]
#![feature(core_intrinsics)]
use std::intrinsics::rustc_peek;
#[no_mangle]
fn foo() -> i32 {
    let x = 0;
    rustc_peek(x)
}

=== stdout ===
=== stderr ===
warning: the feature `core_intrinsics` is internal to the compiler or standard library
 --> /home/runner/work/glacier/glacier/ices/86720.rs:2:12
  |
2 | #![feature(core_intrinsics)]
  |            ^^^^^^^^^^^^^^^
  |
  = note: using it is strongly discouraged
  = note: `#[warn(internal_features)]` on by default

warning: 1 warning emitted

==============