Use sdallocx for IOBuf::releaseStorage
Use sdallocx for IOBuf::releaseStorage

Summary: Use sdallocx for IOBuf::releaseStorage

Reviewed By: marksantaniello

Differential Revision: D19925485

fbshipit-source-id: 142276fb64e570e10bfd0b6e22d8c83b204d1c2b

facebook/folly,facebook/folly,facebook/folly,facebook/folly,facebook/folly