Bug 1022745 - Add UTM parameters to plugincheck URL. r=gavin, a=sledru

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extra : rebase_source : 9dc3c29814fdc18967577c529385284d137b4429
Bug 1028990 - Never eliminate GetPropertyPolymorphic instructions. r=jandem, a=sledru

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extra : rebase_source : 4a9a6ccc4fbd7bac8dfbd221aebe7af0e0cb2212