[scudo] Reduce the scope of AllocAfterFork am: 57f742c759 am: 002bf7cb2d am: 7db72bdd73 am: 07ec1a09ad am: 9021dba245

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

Change-Id: Iefda23820f3f26837bd48e080ffd2d3d5ba7fcdc