Add SIMD helpers to SPHCellList#169

AhmedSalih3d wants to merge 2 commits intocodex/refactor-to-avoid-if-statementAhmedSalih3d/SPHExample:codex/refactor-to-avoid-if-statementfrom

codex/evaluate-and-implement-simd.jl-enhancementsAhmedSalih3d/SPHExample:codex/evaluate-and-implement-simd.jl-enhancementsCopy head branch name to clipboard