Bug 944040 - Do not use the store buffer during moving GC; r=jonco

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extra : rebase_source : cca04b1eb34c733a615a8cab12fb1625e940a1c9
Bug 902174 - Aggressively optimize js::gc::StoreBuffer for size; r=jonco

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extra : rebase_source : 872d440225303d9557e8718471404fc9e08dc9c6