Performance#30

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taokayan wants to merge 5 commits intoEOSIO:masterfrom

taokayan:performance

Commits on Nov 28, 2018

performance improve by move old buffer to backup instead of allocating backup buffer
taokayan
committed

Commits on Nov 29, 2018

Commits on Nov 30, 2018

fix modify, add replace, use move-copy as possibble
taokayan
committed

Commits on Dec 3, 2018

fix replace
taokayan
committed