Merge "riscv64: add vector stpcpy()." into main am: 45c7ae46d5

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2768377

Change-Id: Idaf8772f4e3d92f22ed7362b2a956bd541a8e207
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>