Chad Austin 79712c35cb Disallow Optional::operator=(nullptr_t) unless T is a pointer
Summary: The old implementation of folly::none inadvertently allowed disengaging an optional by writing `op = nullptr`. Disallow that and require `op = folly::none`.

Reviewed By: yfeldblum

Differential Revision: D12884724

fbshipit-source-id: b17bcf00b245069d8ea2d9bc3703b0fdcaa85c07
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