nightly-2024-05-12: fix: Fix no predicates for brillig with intermediate functions (#5015)

# Description

## Problem\*

Fixes https://github.com/noir-lang/noir/pull/5012 using the entry point
instead of the source function, to consider intermediate functions.

## Summary\*



## Additional Context



## Documentation\*

Check one:
- [x] No documentation needed.
- [ ] Documentation included in this PR.
- [ ] **[For Experimental Features]** Documentation to be submitted in a
separate PR.

# PR Checklist\*

- [x] I have tested the changes locally.
- [x] I have formatted the changes with [Prettier](https://prettier.io/)
and/or `cargo fmt` on default settings.