backport: src,tools: speed up startup by 2.5% - #9693

backport: src,tools: speed up startup by 2.5%#9693

Qard wants to merge 5 commits into

nodejs:v6.x-stagingnodejs/node:v6.x-stagingfrom

Qard:backport-5458-to-v6.xQard/node:backport-5458-to-v6.xCopy head branch name to clipboard