[inductor] Fix bug where a node gets erased twice (#100848)
Fixes #100806
The underlying bug is if you erase an FX node twice, everything runs without error, but `len(graph.nodes)` reports the incorrect value.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/100848
Approved by: https://github.com/ngimel, https://github.com/Skylion007
