Merge "libc: swap to llvm-libc for 8 fns on x86_64" into main am: 706487c70f am: 8540eaa15e

Original change: https://android-review.googlesource.com/c/platform/bionic/+/3363339

Change-Id: Ic571c170d41af8e0dce04fc8f67e61a9af3589cd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>