Supporting `div` and `%`

[kimikage]

I think div and % should be interpreted as aliases for ÷ and rem.

julia> @macroexpand(@checked typemax(UInt) ÷ -1)
:(Base.Checked.checked_div(typemax(UInt), -1))

julia> @macroexpand(@checked div(typemax(UInt), -1))
:(div(typemax(UInt), -1))

julia> @macroexpand(@checked typemax(UInt) % -1)
:(typemax(UInt) % -1)

julia> @macroexpand(@checked rem(typemax(UInt), -1))
:(Base.Checked.checked_rem(typemax(UInt), -1))