message: Make alignment checks a future incompat lint
diff: @@ -24,6 +24,7 @@ use rustc_span::def_id::{CrateNum, DefId};
  use rustc_span::Symbol;
  use rustc_target::abi::Size;
  use rustc_target::spec::abi::Abi;
  +use rustc_const_eval::const_eval::CheckAlignment;
  use crate::{
  concurrency::{data_race, weak_memory},
  @@ -752,8 +753,12 @@ impl<'mir, 'tcx> Machine<'mir, 'tcx> for MiriMachine<'mir, 'tcx> {
  const PANIC_ON_ALLOC_FAIL: bool = false;
  #[inline(always)]
  - fn enforce_alignment(ecx: &MiriInterpCx<'mir, 'tcx>) -> bool {
  - ecx.machine.check_alignment != AlignmentCheck::None
  + fn enforce_alignment(ecx: &MiriInterpCx<'mir, 'tcx>) -> CheckAlignment {
  + if ecx.machine.check_alignment == AlignmentCheck::None {
  + CheckAlignment::No
  + } else {
  + CheckAlignment::Error
  + }
  }
  #[inline(always)]
  