Bug 1048699 - Make Exposed=SpecificWorkerType work automatically. r=bz

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extra : rebase_source : 651bd062b015e2aa030b87a842bc7d63dccf349c
Bug 1059606: Take into account that coerced math builtin calls can be in deadCode; r=luke

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extra : rebase_source : 2017251dd162966e01a8047d8840301d7c427106