[SCEV] Canonicalize "A /u C1 /u C2" to "A /u (C1*C2)".

Summary: FWIW InstCombine already folds this. Also avoid the case where C1*C2 overflows.

Reviewers: sunfish, sanjoy

Subscribers: hiraditya, bixia, llvm-commits

Differential Revision: https://reviews.llvm.org/D47965

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334425 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed