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c9c8259ed0
Previously, in cases like
```python
def foo(x):
x.bar()
x.baz()
x.quux()
```
we would have flow from the first `x` to each use _and_ flow from the
post-update node for each method call to each subsequent use, and all
of these would be `LocalSourceNode`s. For large functions with the above
pattern, this would lead to a quadratic blowup in `hasLocalSource`.
With this commit, only the first of these will count as a
`LocalSourceNode`, and the blowup disappears.