Bug 909709 - Fix # indentation in AsmJSSignalHandlers.cpp (r=glandium)

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extra : rebase_source : b610d4904e7a052216189796ea2ced52097c6a3b
Bug 909709 - Reuse MOZ_LINKER IsSignalHandlingBroken to disable asm.js signal handlers (r=glandium)

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extra : rebase_source : 8f9daa6efb8ccd3344fa789a98a3fff93bbdd68b