[release-branch.go1.25] cmd/compile: do not misscompile x+x << 63 to x << 0 on amd64

For #79182
Fixes #79190

Change-Id: I63ca6cb1bd3f6752a7e9b809cfffc8d45b7adc51
Reviewed-on: https://go-review.googlesource.com/c/go/+/774040
Auto-Submit: Jorropo <jorropo.pgm@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
(cherry picked from commit c3bfc824a58d8cd6871af6825a08a49e9ed16a26)
Reviewed-on: https://go-review.googlesource.com/c/go/+/783601
Reviewed-by: Junyang Shao <shaojunyang@google.com>
Reviewed-by: Jorropo <jorropo.pgm@gmail.com>
3 files changed
tree: 0d3ff1d93550c3c8ec4b8c1dc002b51f157fad5f
  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
  17. VERSION
README.md

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