[cfe-commits] Mark virtual members used in a deterministic order

[Rafael Espíndola]

> 4 Add a deterministic iterator to CXXFinalOverriderMap.
>

I decided to try to implement this and I think the result is a bit
better. The densemap in  CXXFinalOverriderMap now maps to indexes in a
vector of values. This works because we never remove an element from
it. When we want to iterate over all the values, we just use the
vector.

Cheers,
Rafael
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