regression: internal compiler error value <= 0xFFFF_FF00 in rustc_abi

[Mark-Simulacrum]

See https://crater-reports.s3.amazonaws.com/beta-1.70-2/beta-2023-05-08/gh/skius.headlessmc/log.txt

thread 'rustc' panicked at 'assertion failed: value <= 0xFFFF_FF00', /rustc/2013813b65016b39d456a12e3b0a90366e9fb5e3/compiler/rustc_abi/src/lib.rs:1407:1
...

[apiraino]

WG-prioritization assigning priority (Zulip discussion).

@rustbot label -I-prioritize +P-medium

[Mark-Simulacrum]

Closing as fix, merged and backported.