Bug 945121: Use DebugOnly to fix opt-only 'unused variable' build warning in TestCeilingFloor.cpp. r=Waldo
Bug 952022 - Consolidate detachAsmJSModule and destroyBackedges (r=bhackett)

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extra : rebase_source : 38aba86b0badc80dbfd911cc08450b4d52652bf3