Skip defined checks in folly/Memory.h
Summary: [Folly] Skip `defined` checks in `folly/Memory.h`. Undefined symbols, when evaluated by the preprocessor in preprocessor integer contexts, evaluate to `0`. That works for these checks. Reviewed By: ericniebler Differential Revision: D4385026 fbshipit-source-id: 3162f8b83431ebab2de53f9ba202e7ea8c339210
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