[llvm] r188582 - allow != to compare PointerUnion, we already support ==.

[Chandler Carruth]

On Fri, Aug 16, 2013 at 3:09 PM, Chris Lattner <sabre at nondot.org> wrote:

> +  template<typename PT1, typename PT2>
> +  static bool operator!=(PointerUnion<PT1, PT2> lhs,
> +                         PointerUnion<PT1, PT2> rhs) {
> +    return lhs.getOpaqueValue() == rhs.getOpaqueValue();
>

Notably, a unit test might have noticed that this doesn't seem quite the
right implementation of !=...
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