Prevents potential double free if
ReleaseAllocatedMemoryNeededForWritableChunk were to be called twice.

Change-Id: I97f0b3e6a279297faa37d541b81f465fec68b894
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1667414Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Maciej Goszczycki <goszczycki@google.com>
Cr-Commit-Position: refs/heads/master@{#62290}