Deadlock in checker caused by cyclic type dependency

[FrancisTheCat]

Context

Operating System & Odin Version:

Odin:    dev-2025-11:5e3648b83
OS:      Arch Linux, Linux 6.17.8-arch1-1
CPU:     AMD Ryzen 5 7640U w/ Radeon 760M Graphics
RAM:     19798 MiB
Backend: LLVM 21.1.5

Failure Information (for bugs)

Neither -no-threaded-checker nor -thread-count:1 help.
The checker seems to get stuck waiting here:

Odin/src/types.cpp

Line 3642 in 5e3648b

wait_signal_until_available(&type->Struct.fields_wait_signal);

Steps to Reproduce

package test

Bar :: struct {
	foo: Foo,
}

Foo :: Bar{}.foo