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Perform manual loop fission in bayestar_sky_map_toa_phoa_snr_pixel

Leo P. Singer requested to merge leo-singer/ligo.skymap:loops-rearranged into master

Rearrange loops and rewrite one key loop with explicit SIMD intrinsics. This is seen to provide a speedup by a factor of 2 on Intel Skylake machines.

Edited by Leo P. Singer

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