ICE (assertion) on wrong lang-items signature

[pravic]

If you specify the "custom-unwind-resume": true in target.json and use well-known (from guides/book)
#[lang = "eh_unwind_resume"] extern fn rust_eh_unwind_resume() {}, you can see the llvm assert "Calling a function with bad signature!" at src/llvm/lib/IR/Instructions.cpp:240.

Nightly rustc (all msvc/gnu/linux targets).

[Mark-Simulacrum]

Could someone provide a list of steps to follow to reproduce this? It's hard to tell exactly how to do this from the issue itself and I've been unable to come up with them based on ~10 minutes of utilizing Google.

[Mark-Simulacrum]

Going to close this in favor of #9307 since it tracks the cause (lang items not being type checked).