Merge "libutils: RefBase: extra check for double own" am: b0fe01da am:...

Merge "libutils: RefBase: extra check for double own" am: b0fe01da am: 414bab91 am: 1908c247 am: 5448e26c

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2166103



Change-Id: I01fd4149a95ab7608ac8a5170c4e326a2ff49644
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>