fix #2, bug in Diagonal::MaxRowsAtCompileTime when Index==Dynamic
fix #2, bug in Diagonal::MaxRowsAtCompileTime when Index==Dynamic

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