cmd/internal/obj/mips,s390x,riscv: save LR after decrementing SP

cmd/internal/obj/mips,s390x,riscv: save LR after decrementing SP

Following CL 412474, for the rest of the LR architectures. On
MIPS(32/64), S390X, and RISCV, there is no single instruction that
saves the LR and decrements the SP, so we need to insert an
instruction to save the LR after decrementing the SP.

On ARM(32) and PPC64 we already use a single instruction to save
the LR and decrement the SP.

Updates #53374.

Change-Id: I5a2e211026d95edb0e0f7d084ddb784f8077b86d
Reviewed-on: https://go-review.googlesource.com/c/go/+/413428
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>