[PartitionAlloc] Revert "poison on free" behavior.

Performance regressions, alas.

Bug: 1005070, 1013329, 1013326, 1013324
Change-Id: I15c0a539d5adde6f86de98ceec301863708307f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1880145
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Chris Palmer <palmer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709322}
1 file changed