Regression of T12433

While trying to find a bug in my branch, I found that there seems to be a regression of test case T12433 (#12433 (closed)):

Expected output of T12433: 8 Compiling with GHC 9.2.2, using no optimizations or any opt. level works: e.g.: ghc -O1 testsuite/tests/codeGen/should_run/T12433.hs && ./T12433 prints 8

Using GHC main HEAD (eb425eef418), flavour devel2:

/path/ghcmain/ghc/_build/stage1/bin/ghc T12433.hs && ./T12433 -- prints 8 works

Using any optimization level fails:

/path/ghcmain/ghc/_build/stage1/bin/ghc -O1 T12433.hs && ./T12433 -- prints 4229782

• Operating System: Ubuntu 20.04
• System Architecture: x86_64

Compiled with GHC 9.2.2:

T12433.ghc922-noopt.cmm

T12433.ghc922-opt.cmm

Compiled with HEAD:

T12433.noopt.cmm

T12433.opt.cmm