Bug 1004503 - Backout of failed attempt to fix relazification-related crash. r=jandem

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extra : rebase_source : e3b1a9f60f34d0b366cbc4f3bb98212f714525ce
Bug 1005472 - Make trace-logging work on OS X again. r=h4writer

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extra : rebase_source : 293de5fe9aed1df6da80a05953759b81e4c5d9c0