In !11902, I found out that there were no jobs in `full-ci` that would run the `FMA_Primops` test using LLVM, even though the test specifies `when(have_llvm(), extra_ways(["optllvm"]))`. I had to tag the MR with `LLVM backend` to get the `x86_64-linux-deb12-validate+llvm` job which ran that job using LLVM. Moreover, it seems that the `aarch64-linux-deb12-validate+llvm` did not run that test with LLVM (despite the job name), as evidenced by the fact that [this job](https://gitlab.haskell.org/ghc/ghc/-/jobs/1753679) passed at a commit of the MR which is known to be wrong (as evidenced by [this job](https://gitlab.haskell.org/ghc/ghc/-/jobs/1753575) failing).