cmd/dist, cmd/link, internal, runtime: implement buildmode=plugin for linux/loong64
According to review, buildmode=shared has unfixed shortcomings and
should be considered legacy at this time. So only buildmode=plugin is
going to be added for loong64 which is a relatively new platform.
Change-Id: Iac0b9f57e4ee01755458e180bb24d1b2a146fdf0
Reviewed-on: https://go-review.googlesource.com/c/go/+/480878
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Michael Knyszek <mknyszek@google.com>
Run-TryBot: WANG Xuerui <git@xen0n.name> Reviewed-by: David Chase <drchase@google.com> Reviewed-by: abner chenc <chenguoqi@loongson.cn> Reviewed-by: Meidan Li <limeidan@loongson.cn>