[llvm] Revert "[SCEV] Fold (C1 * A /u C2) -> A /u (C2 /u C1), if C2 > C1." (PR #158328)

[Reid Kleckner via llvm-commits]

rnk wrote:

I talked to @durin42 and @zmodem, and they scheduled an hour on Monday to capture a reproducer from the Rust failure.

https://github.com/llvm/llvm-project/pull/158328