Merge "libprocessgroup: fix boot time performance regression" am: e89ee18b

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2467504



Change-Id: Iddcb0c1771b1a247732974dc6c360ce3509e8ee8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>