Merge "Add source of unwind when fatal error." into main am: 122a5763 am: f65b6cc7

Original change: https://android-review.googlesource.com/c/platform/system/core/+/3349258



Change-Id: Ic0b5b09753be0b9d715294e16b4376b4d15d43d2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>