[scudo] Reduce the scope of AllocAfterFork am: 57f742c759 am: 002bf7cb2d am: 7db72bdd73 am: 07ec1a09ad

Original change: https://android-review.googlesource.com/c/platform/external/scudo/+/1850665

Change-Id: Ie841481f090441e539d4a031fec8f1bcd6171f35