Merge "Explicitly ignore the result of std::async" into main am: 60dbdaa3...

Merge "Explicitly ignore the result of std::async" into main am: 60dbdaa3 am: 488f4b5a am: 15f4f0a1

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2673359



Change-Id: Id5114174279249aabf2cb05b5caafa66005c158d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>