Merge "librust_baremetal: statically choose x86_64 memset" into main am: 42992d6413 am: bb86926aa0

Original change: https://android-review.googlesource.com/c/platform/bionic/+/3489695

Change-Id: Ie52a51b66bd126efb5a7da39eb5d636ccdd11652
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>