patch: fix odr of pure functions in declrefexpr

[Nick Lewycky]

This patch makes "&Cls::purevfn" not an odr use. This isn't what the
standard says, but that's a defect (to be filed). "Cls::purevfn()" is still
an odr use.

Also fixes a bug in the previous patch that caused us to not mark the
function referenced just because we didn't want to mark it odr used.

Please review!

Nick
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