add benchmark for sum
add benchmark for sum

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