Revert "cmd/compile: use MOVBE instruction for GOAMD64>=v3"

This reverts CL 354670.

Reason for revert: broke make.bash with GOAMD64=v3.

Fixes #49061.

Change-Id: I7f2ed99b7c10100c4e0c1462ea91c4c9d8c609b2
Reviewed-on: https://go-review.googlesource.com/c/go/+/356790
Trust: Daniel Martí <mvdan@mvdan.cc>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Koichi Shiraishi <zchee.io@gmail.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
7 files changed
tree: 5d55989c50ac5d3d4d40238d5c50afe3575d368c
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. codereview.cfg
  12. CONTRIBUTING.md
  13. CONTRIBUTORS
  14. LICENSE
  15. PATENTS
  16. README.md
  17. SECURITY.md
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