beta regresssion: ICE: allocation missing in dead_alloc_map

[alexcrichton]

Discovered by crater, looks like:

$ git clone https://github.com/faradayio/cage
$ cd cage
$ cargo test --no-default-features # passes
$ cargo +beta test --no-default-features # ICEs

cc @rust-lang/compiler, cc @emk

[alexcrichton]

Also rusty_dashed (cc @TLmaK0)

[Mark-Simulacrum]

cc @oli-obk @RalfJung @eddyb -- I think this may have been fixed on master but perhaps not backported? I seem to recall something similar -- perhaps #55287.

[pietroalbini]

This is fixed by #55385, which is in the rollup.

[alexcrichton]

Ok cool, thanks @pietroalbini!