Revert "Merge pull request #15867 from devnexen/haiku_malloc_usable_size"
This reverts commit 3ef91233caf2c637797d84527a4e78f870e4b4b9, reversing
changes made to 2839e35d1c06ca5b6bda1f20ae870f2b2fbbbfb1.
8e9a33b82cAndrew Kelley committed on 7/31/2023, 5:50:48 PMparentdad7eea