[lldb][swift] Fix GetParentIfClosure for Struct/Enum constructors

[felipepiovezan]

There are two possible variants of constructors: allocating (Kind::Allocator)
and initializing (Kind::Constructor). When mangling a closure, the "context"
is arbitrarily chosen to be the initializing variant.
As such, we need to check both when looking for the parent of a closure.
If both exist, `Kind::Constructor` is the one containing user code, so
it is always checked first.

rdar://154309468

[felipepiovezan]

@swift-ci test please

[adrian-prantl]

Suggested change

	// There are two possible variants of constructors: allocating (Kind::Allocator)
	/// There are two possible variants of constructors: allocating (Kind::Allocator)

[adrian-prantl]

We already do so many demangle operations when resolving types that I would rather demangle again here rather than hardcode details of the mangling scheme.

[felipepiovezan]

It's not so much about demangling again, it's about reconstructing the entire demangle tree.
There is no "node.setKind", we are forced to rebuild everything, and I don't think there are any APIs today to do this

[felipepiovezan]

I think I found a way to do it.

[adrian-prantl]

I would write this as

print("break_ctor_enum")
return $0 

for more breakpoint stability

[felipepiovezan]

I'll update it, but note that this will be different from all other entries in this file.

[felipepiovezan]

@swift-ci test