Merge "Explicitly ignore the result of std::async" into main am: 60dbdaa3fa am: 488f4b5a39

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

Change-Id: I82e8c9a67da91d5d0dc4a286239978fbde6f9595
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>