fix potential compilation issue on MSVC + no vectorization
fix potential compilation issue on MSVC + no vectorization

cjntaylor/eigen,TSC21/Eigen,TSC21/Eigen,toastedcrumpets/eigen,pthulhu/eigen,pasuka/eigen,ritsu1228/eigen,Zefz/eigen,toastedcrumpets/eigen,cjntaylor/eigen,ROCmSoftwarePlatform/hipeigen,TSC21/Eigen,Zefz/eigen,pasuka/eigen,ROCmSoftwarePlatform/hipeigen,ritsu1228/eigen,pthulhu/eigen,Zefz/eigen,cjntaylor/eigen,pthulhu/eigen,pasuka/eigen,ROCmSoftwarePlatform/hipeigen,toastedcrumpets/eigen,ritsu1228/eigen,pasuka/eigen,pthulhu/eigen,ritsu1228/eigen,cjntaylor/eigen,toastedcrumpets/eigen,ROCmSoftwarePlatform/hipeigen,ritsu1228/eigen,TSC21/Eigen,pasuka/eigen,Zefz/eigen,pthulhu/eigen