miri no longer builds after rust-lang/rust#63402

[rust-highfive]

Hello, this is your friendly neighborhood mergebot.
After merging PR #63402, 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 @estebank, do you think you would have time to do the follow-up work?
If so, that would be great!

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

[RalfJung]

#63402 introduced an ICE (integer overflow) in the error emitting code, that Miri runs into.

[estebank]

#64029 will fix the issue on rustc's end, which should automatically fix this one.