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Linux kernel on loong64 has no Dup2 syscall support, so we use Dup3 to replace it like arm64 and riscv64. Updates #53301 Fixes #58784 Change-Id: I4e0be140a71b86f4626ed39d76cf3ac78f842018 Reviewed-on: https://go-review.googlesource.com/c/go/+/425478 Auto-Submit: Ian Lance Taylor <iant@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com> Run-TryBot: WANG Xuerui <git@xen0n.name> Reviewed-by: David Chase <drchase@google.com> Reviewed-by: abner chenc <chenguoqi@loongson.cn> Run-TryBot: Ian Lance Taylor <iant@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: xiaodong liu <teaofmoli@gmail.com> Reviewed-by: WANG Xuerui <git@xen0n.name>