Fix a broken DCHECK when logging existing baseline code.

Bug: v8:11420
Change-Id: I66cf1b1b806aef74bcc9c1a0061bec1834b719f6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2786850Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73667}