cmd/internal/obj/s390x, runtime: fix breakpoint in s390x
Currently runtime.Breakpoint generates SIGSEGV in s390x.
The solution to this is add new asm instruction BRRK of
type FORMAT_E for the breakpoint exception.
Fixes #52103
Change-Id: I8358a56e428849a5d28d5ade141e1d7310bee084
Reviewed-on: https://go-review.googlesource.com/c/go/+/457456 Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@google.com>