internal/bytealg: clean up and simplify the riscv64 equal implementation
Now that riscv64 is only regabi, remove the entrypoint separation and
have runtime.memequal_varlen call runtime.memequal. Add a zero byte
length check and replace the equal and not equal exit paths with a
single exit path that conditions on length reaching zero.
Cq-Include-Trybots: luci.golang.try:gotip-linux-riscv64
Change-Id: Ida4e54378daa7fd423f759753eba04ce513a27cb
Reviewed-on: https://go-review.googlesource.com/c/go/+/648855 Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Meng Zhuo <mengzhuo1203@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Michael Knyszek <mknyszek@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com>