Optimize copy/move
Summary: this diff provides methods that allow to avoid temporaries while cloning IOBufs. Also optimizes move constructor a bit - there is no need to call `decrementRefCount`, check for self assignment, etc. Reviewed By: yfeldblum Differential Revision: D3250456 fb-gh-sync-id: 32b0180c28f36151c6786dba6f511b491b224200 fbshipit-source-id: 32b0180c28f36151c6786dba6f511b491b224200
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