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 am: 5074f0a4

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



Change-Id: I0d41f2b0ff656f689bf563d5f40e720c65f5a5b3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>