cmd/link, cmd/internal/obj: fix a remote call failure issue

cmd/link, cmd/internal/obj: fix a remote call failure issue

When a function call exceeds the immediate value range of the instruction,
a trampoline is required to assist in the jump. Trampoline is only omitted
when plt is needed; otherwise, a check is required.

Change-Id: I7fe2e08d75f6f574475837b560e650bbd4215858
Reviewed-on: https://go-review.googlesource.com/c/go/+/724580
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: sophie zhao <zhaoxiaolin@loongson.cn>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>