[InstCombine] add more tests for udiv/urem narrowing; NFC

We don't currently limit these folds with hasOneUse() or shouldChangeType().


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@311390 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed