Bump rewriter from 5d274d2 to 3e84ec2

Bumps [rewriter](https://github.com/mit-plv/rewriter) from `5d274d2` to `3e84ec2`.
- [Release notes](https://github.com/mit-plv/rewriter/releases)
- [Commits](mit-plv/rewriter@5d274d2...3e84ec2)

---
updated-dependencies:
- dependency-name: rewriter
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>