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Sven Over authored
Summary:Most header files in folly already used "#pragma once" to protect against multiple inclusion. This diff removes old-style ifndef/define/endif header guards and replaces them with pragma once. In some cases the defined symbol is tested in other header files. In those cases the "#define" is kept. Reviewed By: igorsugak Differential Revision: D3054492 fb-gh-sync-id: 20aa0b9b926a30dd021e4b8f5440e8888874681c fbshipit-source-id: 20aa0b9b926a30dd021e4b8f5440e8888874681c
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