Add DebugData to AssemblyItem.

[aarlt]

No description provided.

[ekpyron]

I'd call this almost done short of some very minor tweaks - nice that it just seems to work so far without too many complications!

[ekpyron]

Suggested change

	void setDebugData(langutil::DebugData::ConstPtr const& _debugData) { m_debugData = _debugData; }
	void setDebugData(langutil::DebugData::ConstPtr const& _debugData)
	{
	solAssert(_debugData);
	m_debugData = _debugData;
	}

if we want to guarantee that there's always a valid one there, we also need to do it here.

[ekpyron]

If you want, while you're at it: passing the pointer by value and moving it is, I think, a bit more idiomatic for shared pointers... but also doesn't matter too much (and it's also not consistently done one way or the other on develop either)

[aarlt]

You're right! I change that only where it is possible to use std::move - e.g. if there is exactly one other place where this pointer can be moved. I let it be a constant reference, when the pointer is used to set multiple things.

[ekpyron]

Ok, we somehow lost the change for #14841 (comment) (although it's also not exactly super vital) - and apart from that
#14841 (comment)
is the only thing missing I can still find.