add first_multiple helper function
add first_multiple helper function

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