[Polly] Remove CodegenCleanupPass.

The pass uses a bunch of deprecated legacy passes and appears unused.
Remove it to unblock removing legacy passes.

Fixes https://github.com/llvm/llvm-project/issues/60852

Reviewed By: Meinersbur

Differential Revision: https://reviews.llvm.org/D144332

GitOrigin-RevId: 934c82d31801e65aa3bbe99a0e64f903621c2e04
4 files changed