fix dequantization to match nnpi (#41505)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/41505
fix the dequantization to match the fixes from quantization
Test Plan:
test is not conclusive, since only comparing emulation with reference collected from Amy's run
running an evaluation workflow at the moment
Reviewed By: venkatacrc
Differential Revision: D22558092
fbshipit-source-id: 3ff00ea15eac76007e194659c3b4949f07ff02a4
