[Issue 18846] VisualD - show vtable in debugger

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18846

--- Comment #9 from Manu <turkeyman at gmail.com> ---
Also, another super-minor detail.
In C++, it shows the derived type member at the top, then __vfptr (ie, first
member), then the normal member listing.

In Mago, it's showing __vfptr at the top, then the derived type member, then
the normal members.
Can we swap those top 2 items to match C++? __vfptr is really just the first
member, and it feels strange when it's disconnected from the other members
(separated by the derived accessor) that way.

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