Merge "Add multithreads throughput benchmark" into main am: 9ac6169db4 am: 2e6a1923f3 am: 33bc3b7809 am: fd7118ed66

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2645428

Change-Id: If1ab9bff8305dace68bf6bd62bd338e3df5a439c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>