Revert "[ScalarEvolution] createSCEV(): recognize `udiv`/`urem` disguised as an `sdiv`/`srem`"

Summary:
This reverts commit 2c16100e.

ninja check-polly fails:
  Polly :: Isl/CodeGen/MemAccess/generate-all.ll
  Polly :: ScopInfo/multidim_srem.ll

Reviewers: kadircet, bollu

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D83230