Bug 927685 - Enable --ion-parallel-compile=on by default in the shell; r=jandem,sr=jorendorff
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Bug 927685 - Followup to fix bustage in --disable-threadsafe builds on a CLOSED TREE; r=bustage

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extra : rebase_source : b6f59f7f173e0e7c34b60cd0268cc9c36a0f485a