sizeof... a parameter pack should be an unevaluated context.
sizeof... a parameter pack should be an unevaluated context.

- can't think of a way to test this without generic lambda captures, but will include a test once that patch is made commit-ready.

patch was ok'd by Doug.
http://llvm-reviews.chandlerc.com/D2029 

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@193757 91177308-0d34-0410-b5e6-96231b3b80d8

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