Bug 981289 - Do not forget to mark non-argument properties on arguments objects; r=sfink

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extra : rebase_source : 65efd356afcf34b6b71737f531d54c8408889ba0
Bug 981296 - Do not make assertions on the initial shape table before it is created; r=sfink

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extra : rebase_source : c67d16dac8449564940fcdee94a0d83988207796
Bug 981295 - Do not re-use IsAboutToBeFinalized to implement UpdateIfRelocated; r=sfink