add folly::as_const, like C++17's std::as_const
Summary: A one-liner from C++17, but a useful one. Const-qualifies an lvalue reference, avoiding the need for an awkward const_cast in some cases. Reviewed By: yfeldblum Differential Revision: D4389929 fbshipit-source-id: 1650c4901489eb0dd62fd9fa633b4a0da9f01954
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