Fix promoteTypes for QInt types (#19182)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/19182
This is a bug discovered by zafartahirov, right now if one of the tensor is QInt
type we'll return undefined, but actually we want to allow ops that accepts
Tensors of the same QInt type to work.
Reviewed By: zafartahirov
Differential Revision: D14909172
fbshipit-source-id: 492fd6403da8c56e180efe9d632a3b7fc879aecf
