cmm/CBE: Fix a few more zip uses
cmm/CBE: Fix a few more zip uses

Ensure that we don't consider lists of equal length to be equal when
they are not. I noticed these while working on the fix for #14361.

Reviewers: austin, simonmar, michalt

Reviewed By: michalt

Subscribers: rwbarton, thomie

GHC Trac Issues: #14361

Differential Revision: https://phabricator.haskell.org/D4153

ezyang/ghc,sdiehl/ghc,ezyang/ghc,sdiehl/ghc,sdiehl/ghc,ezyang/ghc,sdiehl/ghc,shlevy/ghc,sdiehl/ghc,sdiehl/ghc,shlevy/ghc,ezyang/ghc,ezyang/ghc,ezyang/ghc,shlevy/ghc,sdiehl/ghc,shlevy/ghc,ezyang/ghc,shlevy/ghc,shlevy/ghc,shlevy/ghc