[ONNX] Fix graph position to insert clone node for inplace op removal (#50123) (#51520)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/51520
Previous insertBefore approach might end-up inserting clone node in inner sub-blocks, while then the node being used later at other outside call sites.
Test Plan: Imported from OSS
Reviewed By: pbelevich
Differential Revision: D26203124
Pulled By: SplitInfinity
fbshipit-source-id: 999511e901ad1087f360bb689fcdfc3743c78aa4
