Save some memory in examples/solver
Save some memory in examples/solver

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