add folly:hasher<bool>
Summary: hasher<bool> is a trivial thing, but it is useful, if we implement a hash function for a class by writing something like: return folly::Hash()(boolField1_, boolField2_, intField3_, boolField4_, someField5_) Reviewed By: ot Differential Revision: D4535563 fbshipit-source-id: 5e6672c2eeaebbbac80a8a066a6a0ec4838810f4
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