Bug 885729 - Inline array and proxy specializations of js::DefineProperty into js::DefineProperties. r=jwalden

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extra : rebase_source : eaed8f6a1ba9a171c3d0d47641482b8d3273bd8d
Bug 885553 - Implement ES6 Array.prototype.find and Array.prototype.findIndex. r=jwalden

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extra : rebase_source : ca717dae292897561f503ab2d5964f02915f5067
Bug 886911 - Don't cancel off-thread compilation for minor GCs. r=terrence