Implicit panic calls not collected during monomorphization

[nbdd0121]

Implicit panic calls can be generated from Assert MIR terminator, but they are not collected during monomorphization. This means that link error will occur if the panic functions are not codegenned with core crate, e.g. when it is marked inline.

This causes breakage in rust-lang/cargo#10019 when #90273 changes the function to be inline if panic_immediate_abort is set and exposes this issue.

[nbdd0121]

@rustbot label: T-compiler A-codegen
@rustbot claim