[mlir] Introduce a pattern to lower `gpu.subgroup_reduce` to `nvvm.redux_op`

This revision introduces a pattern to lower `gpu.subgroup_reduce` op into to the `nvvm.redux_sync` op. The op must be run by the entire subgroup, otherwise it is undefined behaviour.

It also adds a flag and populate function, because the op is not avaiable for every gpu (sm80+), so it can be used when it is desired.

Depends on D142088

Reviewed By: nicolasvasilache

Differential Revision: https://reviews.llvm.org/D142103