GHC 9.12.1 sub-word division

Mandatory information: * Package : GHC * cvss: `?` * affected versions: 9.12.1 only Optional: * cve: `?` * keywords: `?` * aliases: `?` * related: `?` * affected OSes: `?` * affected architecture: `?` * declarations: `?` * Long description: `?` ---- References: * https://discourse.haskell.org/t/psa-correctness-issue-in-ghc-9-12/11204 * https://gitlab.haskell.org/ghc/ghc/-/issues/25653