e438a903db
`max-children-depth` was [originally 6][1], which produced too large of
output. It was then [reduced to 4][2], which for some people is too low.
This change is to try 5 as the default.
Originally upstreamed in
https://github.com/llvm/llvm-project/pull/149282
[1]:
ee0782bf6b
[2]: https://github.com/swiftlang/llvm-project/pull/10683