Comment # 18 on bug 1180610 from Jiri Slaby

In upstream as:
commit 6833e0b81aed44c0510aaf2eb72722ba1cf7ddbe
Author: Jiri Slaby <jirislaby@kernel.org>
Date:   Wed Feb 17 13:21:25 2021 +0100

    perf symbols: Resolve symbols against debug file first

Committed.