Branch of `SciMLBase.has_ldiv` in `defaultalg`

[vpuri3]

in default alg branch on

if SciMLBase.has_ldiv!(A)
    # do ldiv!(u, A, b) via solve_function
elseif SciMLBase.has_ldiv(A)
    # do u .= A \ b via solve_function
end

[ChrisRackauckas]

Handled