miri no longer builds after rust-lang/rust#63637

[rust-highfive]

Hello, this is your friendly neighborhood mergebot.
After merging PR #63637, I observed that the tool miri has failing tests.
A follow-up PR to the repository https://github.com/rust-lang/miri is needed to fix the fallout.

cc @alexcrichton, do you think you would have time to do the follow-up work?
If so, that would be great!

cc @Mark-Simulacrum, the PR reviewer, and @rust-lang/compiler -- nominating for prioritization.

[RalfJung]

Needs a xargo fix, which is on its way at japaric/xargo#250.