Bug 850548 - fix ion::StackAlignment value on non-GNU (r=dvander)

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extra : rebase_source : 424e4aa6cdd104b0c7f47b9c6495f45c770d155f
Bug 848639 - Prevent DecodeHeader for Ogg Skeleton tracks from failing on valid indexes - r=cpearce

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extra : rebase_source : cb913d45d6b9ab396b563391f3ccd096500dcef1