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Add direct SSE intrinsics for IntersectionBoard with MSVC
IntersectionBoardBench_marty: 11.2ms -> 4.3ms (compared to 1.7ms with clang) IntersectionBoardBench_paper: 4.6ms -> 2.1ms (compared to .68ms with clang) On clang, the vector code without SSE intrinsics gets slightly better performance, so only use the intrinsics when we're not compiling with clang. Diffs=
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