Merge "riscv64: add vector stpcpy()." into main am: 45c7ae46d5 am: a16d951f61

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

Change-Id: Ia1dc8cb6f26477d5a1f2c74bb04475a3bdbf4865
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>