message: avoid printing the tag twice
diff: @@ -497,7 +497,7 @@ impl AllocationExtra<Tag> for Stacks {
  ptr: Pointer<Tag>,
  size: Size,
  ) -> EvalResult<'tcx> {
  - trace!("read access with tag {:?}: {:?}, size {}", ptr.tag, ptr, size.bytes());
  + trace!("read access with tag {:?}: {:?}, size {}", ptr.tag, ptr.erase_tag(), size.bytes());
  alloc.extra.for_each(ptr, size, |stack, global| {
  stack.access(AccessKind::Read, ptr.tag, global)?;
  Ok(())
  @@ -510,7 +510,7 @@ impl AllocationExtra<Tag> for Stacks {
  ptr: Pointer<Tag>,
  size: Size,
  ) -> EvalResult<'tcx> {
  - trace!("write access with tag {:?}: {:?}, size {}", ptr.tag, ptr, size.bytes());
  + trace!("write access with tag {:?}: {:?}, size {}", ptr.tag, ptr.erase_tag(), size.bytes());
  alloc.extra.for_each(ptr, size, |stack, global| {
  stack.access(AccessKind::Write, ptr.tag, global)?;
  Ok(())
  @@ -523,7 +523,7 @@ impl AllocationExtra<Tag> for Stacks {
  ptr: Pointer<Tag>,
  size: Size,
  ) -> EvalResult<'tcx> {
  - trace!("deallocation with tag {:?}: {:?}, size {}", ptr.tag, ptr, size.bytes());
  + trace!("deallocation with tag {:?}: {:?}, size {}", ptr.tag, ptr.erase_tag(), size.bytes());
  alloc.extra.for_each(ptr, size, |stack, global| {
  stack.dealloc(ptr.tag, global)
  })
  @@ -546,7 +546,7 @@ trait EvalContextPrivExt<'a, 'mir, 'tcx: 'a+'mir>: crate::MiriEvalContextExt<'a,
  let protector = if protect { Some(this.frame().extra) } else { None };
  let ptr = place.ptr.to_ptr()?;
  trace!("reborrow: {} reference {:?} derived from {:?} (pointee {}): {:?}, size {}",
  - kind, new_tag, ptr.tag, place.layout.ty, ptr, size.bytes());
  + kind, new_tag, ptr.tag, place.layout.ty, ptr.erase_tag(), size.bytes());
  // Get the allocation. It might not be mutable, so we cannot use `get_mut`.
  let alloc = this.memory().get(ptr.alloc_id)?;
  