pytorch

49682270 - add shape inference for Int8GenQuantParamsMinMax

add shape inference for Int8GenQuantParamsMinMax Summary: As titleed Test Plan: successful test flow with A* setup: f245569242 Reviewed By: anurag16 Differential Revision: D25966283 fbshipit-source-id: ef9945d5039933df44c2c3c26ca149f47538ff31