cmd/compile: fix loopbce overflow check logic addWillOverflow and subWillOverflow has an implicit assumption that y is positive, using it outside of addU and subU is really incorrect. This CL fixes those incorrect usage to use the correct logic in place. Thanks to Jakub Ciolek for reporting this issue. Fixes #78333 Fixes CVE-2026-27143 Change-Id: I263e8e7ac227e2a68109eb7bbd45f66569ed22ec Reviewed-on: https://go-internal-review.googlesource.com/c/go/+/3700 Reviewed-by: Damien Neil <dneil@google.com> Reviewed-by: Neal Patel <nealpatel@google.com> Reviewed-on: https://go-review.googlesource.com/c/go/+/763765 Reviewed-by: Jakub Ciolek <jakub@ciolek.dev> Reviewed-by: Russ Cox <rsc@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Auto-Submit: David Chase <drchase@google.com>
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