Merge DAGCombiner::visitSREM and DAGCombiner::visitUREM (NFC)

Summary: The two implementations had more code in common than not.

Reviewers: sunfish, MatzeB, sdmitrouk

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D13724

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@250302 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed