folly | Fix hard-coded assumption in folly/Portability that MSVC builds always have SSE4.2.
Summary: Windows is always supporting SSE4_2, right? What could go wrong? Well, we want to support UWP targeting ARM, meaning that well, we don't have SSE4.2, which causes all different sort of fun things. One of them - boost screaming in agony about both NEON SIMD and SSE instructions available. Fix it, by ensuring that we only ever declare that we support SSE, if we are not arm. Reviewed By: rudybear Differential Revision: D30095193 fbshipit-source-id: e303f90348116cd3b5ea618dc737a647d7aa2cd6
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