Try splitting the `finally` cluster

[tmr232]

Cases like the ones below show how clusters can get a bit weird.
I want to experiment and see whether splitting them makes the graphs more or less readable.

https://tmr232.github.io/function-graph-overview/render/?github=https%3A%2F%2Fgithub.com%2Fpython%2Fcpython%2Fblob%2Faf6b3b825f3b653ffdb29fc1dd36de8acfe0a641%2FLib%2Ftest%2Ftest_monitoring.py%23L590&colors=dark

https://tmr232.github.io/function-graph-overview/render/?github=https%3A%2F%2Fgithub.com%2Fpypy%2Fpypy%2Fblob%2F9abbb4f358a5c308aefb85652a229cc98f899e13%2Flib-python%2F2.7%2Ftest%2Ftest_io.py%23L3316&colors=dark