Bug 1029126 - Fix out-of-range assignment warning in typed-object field offset calculation code.  r=shu

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extra : rebase_source : 82c837c60b46a7d7dc52b2ea39c864e5f5c2c18f
Bug 1029118 - Remove the now-dead (as of window WebIDLification) js::ReportIfUndeclaredVarAssignment.  r=till

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extra : rebase_source : 4f00ec895b255f1bc22d8b22094cff43d6d41278