Bug 1026877 - OdinMonkey: tidy up AsmJSModule, part 1 (r=bbouvier)

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extra : rebase_source : c0c4face5eb8aa70e1f9cc89fc13e3c7522a1f88
Bug 1026877 - OdinMonkey: tidy up AsmJSModule, part 2 (r=bbouvier)

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extra : rebase_source : e34a44dae9619833aeb4b05c00af838daaf42b71