Bug 844196 - Hoist allocation of executable memory (r=jandem)

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extra : rebase_source : aa92f17114e81555711459f88b0d79d260132df7
Bug 844196 - Add SetJitExceptionHandler friend API and call it if unwinding reaches JIT code (r=jandem,dmajor)

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extra : rebase_source : 554cd690441562977aa4756a6fc2a0c0884a13b9
Bug 844196 - Register a JitExceptionHandler for breakpad (r=bsmedberg)

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extra : rebase_source : e4d210a13f08e034b13fa6f3bce13c6b7161cf21