fix(debuginfo): handle false positives in overflow check

[adwinwhite]

Fixes #144636.

Duplicate wrappers and normal recursive types can lead to false positives.

struct Recursive {
	a: Box<Box<Recursive>>,
}

The ADT stack can be:

• Box<Recursive>
• Recursive
• Box<Box<Recursive>> (Box now detected as expanding)

We can filter them out by tracing the generic arg back through the stack, as true expanding recursive types must have their expanding arg used as generic arg throughout.

r? @wesleywiser