[ONNX] ConstantMap setters to update existing value instead of emplace (#67630) (#67812)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/67812
`UpdateShape` uses `.emplace(tensorName, shapeValue)`. This will not update `shapeValue` for `tensorName`, if such name already exist in the map. Hence our code is not able to correct the shape inference error, even if we inferred the shape correctly later.
Test Plan: Imported from OSS
Reviewed By: msaroufim
Differential Revision: D32181300
Pulled By: malfet
fbshipit-source-id: 05c58ad3fdac683ad957996acde8f0ed6341781d
Co-authored-by: BowenBao <bowbao@microsoft.com>
