cmd/internal/obj/loong64: remove the incorrect unsigned instructions

The loong64 ISA does not support the 32-bit unsigned arithmetic
instructions ADDU, SUBU and MULU.

Change-Id: Ifa67de9c59aa12d08844189ed23e6daad0cc11ea
Reviewed-on: https://go-review.googlesource.com/c/go/+/722760
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
7 files changed
tree: 0ff8ab80c722371c902d2c65b808aaac4236c5e3
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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