Use reinterpret_cast for rhs in nonscalar
Use reinterpret_cast for rhs in nonscalar

ddemidov/amgcl,ddemidov/amgcl,dondieselkopf/amgcl,dondieselkopf/amgcl,ddemidov/amgcl,dondieselkopf/amgcl,ddemidov/amgcl