Simple correction over prior commit since TPH no longer needs
to depend on V8 read only heap.

Bug: v8:9533
Change-Id: Icc72cdbb58fb3d9dc79573548cd9fe9cc88b2684
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2039350Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Steve Blackburn <steveblackburn@google.com>
Cr-Commit-Position: refs/heads/master@{#66151}