This CL enables Myers algorithm introduced with
https://crrev.com/c/3804860.

Note that Myers finds slightly different diffs in some cases compared
to the current approach so this CL has to rebaseline one test.

R=kimanh@chromium.org

Bug: chromium:1205288
Change-Id: Ife4708a9edf543db938024a5e14c34a589d6a22a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3810244Reviewed-by: Kim-Anh Tran <kimanh@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82247}