[llvm] [CodeGen] Let `PassBuilder` support machine passes (PR #76320)

[via llvm-commits]

paperchalice wrote:

Remove `CodeGenPassBuilder.h` and `DUMMY_*_PASS`, then no machine passes are included now, because currently no machine pass uses `MACHINE_*_PASS`.

https://github.com/llvm/llvm-project/pull/76320