Michael Schneider 611894329a [ASStackLayoutSpec] Performance improvements (#2470) ...

* Initial commit for ASStackLayoutSpec improvements

* Remove the lock in ASStackLayoutSpec and make the ASStackLayoutSpecStyle const

I think we don't need lock here as the style already has a lock while we set the value

* Add ASStackLayoutSpecItem  that replaces layout specific items

* Prevent baseline pass if not needed

* Update comments

2016-10-30 12:07:18 -07:00

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