message: Changed not_undef to check_init in foreign_items.rs
  Due to changes from upstream, a commit using not_undef was inserted, which had to be updated to use check_init.
  related issue
diff: @@ -200,7 +200,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
  // Miri-specific extern functions
  "miri_static_root" => {
  let &[ptr] = check_arg_count(args)?;
  - let ptr = this.read_scalar(ptr)?.not_undef()?;
  + let ptr = this.read_scalar(ptr)?.check_init()?;
  let ptr = this.force_ptr(ptr)?;
  if ptr.offset != Size::ZERO {
  throw_unsup_format!("pointer passed to miri_static_root must point to beginning of an allocated block");
  