This method is not specified as part of the Allocator requirement, as
is deprecated on std::allocator since C++17.

This also removes the only violation of the 'runtime/references'
cpplint check in the zone directory.

R=mlippautz@chromium.org

Bug: v8:9429, v8:9396
Change-Id: I77c28afbf3c0e122c5ac27796b9f46b6c9455e61
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1690830Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62559}