Drive-by change: Fix wrong reference to FixedRangeBodyDescriptor in
                 implementation-visitor.cc

TBR: ulan@chromium.org
Change-Id: I8a1f468f35c38f5be1f4e8d1cfcc9f0fd2a16381
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2540546
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Auto-Submit: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71223}