[llvm-commits] [patch] Add a MapVector class

[Rafael Espíndola]

The attached patch adds a MapVector class to ADT. It behaves mostly
like a DenseMap (including the iteration order), but provides a
getValues method that can be used to iterate the values in a
deterministic order.

This will be used to fix a non deterministic output order in clang
when two virtual functions are marked used because we output a vtable.

Cheers,
Rafael
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