Merge "Kill its process group even if the given process is already dead" am: 763593e3

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2459289



Change-Id: Icb4b2f94a5ade70ad3ead99a8898cca301dc53b3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>