Bug 885770 - script filename can be NULL in shell load, r=njn

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extra : rebase_source : 25392549ef586f651e03f5ce86c0ebac376f8c1e
Bug 880734 - Assert bound to correct FB in FB funcs, and bind the correct FB on Mesa. - r=bjacob
Silence used-but-not-defined warnings (no bug, r=themaid)

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extra : rebase_source : ba10f39fd67711ef404ed09c0d0a016c01b5d832