Make `InsertQuantDeQuantHelper` global (#30550)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/30550
Right now we have a `InsertQuantDeQuantHelper` for each module, but we need
it to be global because we need to know what graphs have been quantized before
and based on this information we can decide how to handle the module instance.
Test Plan:
test_jit.py, test_quantization.py
Imported from OSS
Differential Revision: D18818651
fbshipit-source-id: bfcaf37094ce20a257171a0c99b05b9348ebc13d
