Bug 992267: Introduce the IsSimdAvailable testing function; r=luke

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extra : rebase_source : 1aa13c372ed7ad209e832599608ef3dd2fef9018
Bug 992267: Ensure stack alignment requirements for asm.js code; r=bbouvier

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extra : rebase_source : 33ca16407cd8b0bd1ca84075dbbb0acbb4272bf6
Bug 992267: Odin basic SIMD support; r=luke
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Bug 992267: Add SIMD globals support to Odin; r=luke

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extra : rebase_source : db317e41bb0b9da6b64e07633e7a192a45c203cf