Merge "Add the L() macro for local labels to <private/bionic_asm.h>." into main am: 6b2aa54a78 am: 5e874c6b8c

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2694748

Change-Id: Iebdc1ea35b4e419cd32999fcfb628c32383701b6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>