Bug 989048 - Do not overwrite emulator's user data image. r=ahal

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extra : rebase_source : d7143ad6539c162f1c3e42211258febe4e862f48
Bug 1106428 - SIMD test cases: Add int32x4.bool to test cases. r=bbouvier

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extra : rebase_source : de4ca9f0a14c275257856d859ea680a8889ebd3d