Revert "[VPlan] Expand WidenInt inductions with nuw/nsw" (#168080)
Reverts llvm/llvm-project#163538
This is causing build failures on the two-stage RVV buildbots. e.g.
https://lab.llvm.org/buildbot/#/builders/214/builds/1363. I've shared a
reproducer and more information at
https://github.com/llvm/llvm-project/pull/163538#issuecomment-3533482822
This reverts commit 355e0f94af5adabe90ac57110ce1b47596afd4cd.