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

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

Change-Id: I098989364b5d481d84ae8365ea52bf082bc8e7f3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>