Adding support for normalization of __is__ op (#57862)
Summary:
normalizing `__is__` to `eq`, and `__isnot__` to `ne` in the case of bools.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/57862
Test Plan:
```
python test/test_jit.py TestPeephole
```
11 Tests, 1 skipped, no failures
Fixes https://github.com/pytorch/pytorch/issues/57387
Reviewed By: eellison
Differential Revision: D28335646
Pulled By: Gamrix
fbshipit-source-id: c9f885044b32897ba35483091bcf7037759b7517
