[quant][graphmode][refactor] Factor out insertDequantCall (#33172)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33172
For code reuse
Test Plan:
.
Imported from OSS
Differential Revision: D20087842
fbshipit-source-id: 797868d31b96c4ff8640121ea4bee1396deb6b57
