Currently the total allocated address space is collected twice per Wasm
memory: Once on allocation, once on release. Recording it once provides
the same data.

R=titzer@chromium.org

Bug: v8:8975
Change-Id: I99719ecb44b14ce5da1be4a74291377f91f4038a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1514738Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60164}