[Attributor] AANoRecurse check all call sites for `norecurse`

If all call sites are in `norecurse` functions we can derive `norecurse`
as the ReversePostOrderFunctionAttrsPass does. This should make
ReversePostOrderFunctionAttrsLegacyPass obsolete once the Attributor is
enabled.

Reviewed By: uenoku

Differential Revision: https://reviews.llvm.org/D72017