scudo: Store header on deallocation before retagging memory. am: e8e24c7c07 am: 4a27ba0f04

Original change: https://android-review.googlesource.com/c/platform/external/scudo/+/1685703

Change-Id: Ib01fcbf7b80828e0a6390f040e9a250a6811d2fa