Make HistogramObserver scriptable with `@torch.jit.ignore` (#27950)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/27950
att
Test Plan:
python test/test_quantization.py
Imported from OSS
Differential Revision: D18360139
fbshipit-source-id: 5459ae49c087886e4990de136198773a75b1c572
