Support Exporting Bitshift to ONNX (#28210)
Summary:
Support exporting left/right bitshifts to ONNX for all opset versions.
ONNX has a bitshift operator in opset 11, but it only supports unsigned ints, so it can't be used in PyTorch (since only uint8 is the only uint type).
Pull Request resolved: https://github.com/pytorch/pytorch/pull/28210
Reviewed By: hl475
Differential Revision: D18575512
Pulled By: houseroad
fbshipit-source-id: 74161db67f599996a0614981edcc171af6780d21
