Merge branch 'improve-label-chinese' of https://github.com/Pisces000221/cocos2d-x into develop
Label::reduce unnecessary calculation amount.
Merge branch 'develop' of git://github.com/cocos2d/cocos2d-x into develop
reduce unnecessary calculation amount.
Merge pull request #5256 from Dhilan007/develop_label

Label::reduce unnecessary calculation amount.