[release-branch.go1.21] cmd/compile: reset memcombine correctly between basic blocks

Not sure why this bug didn't cause a complete failure, but it
certainly makes for doing a lot more work than is necessary.

Fixes #62668

Change-Id: If0be4acb6eafc3d7eeb42d2f4263c21b4e6e1c7d
Reviewed-on: https://go-review.googlesource.com/c/go/+/527699
Reviewed-by: David Chase <drchase@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
(cherry picked from commit 08cdfd06ed1ca21f3b8c95361506ab94c429b622)
Reviewed-on: https://go-review.googlesource.com/c/go/+/528795
Reviewed-by: Keith Randall <khr@google.com>
1 file changed
tree: f4aceb524bf51126602b8f1ccac36d78586d54a6
  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
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