[DAGCombiner] Remove unnecessary check for visitSDIVLike/visitUDIVLike returning a UDIVREM or SDIVREM node.
[DAGCombiner] Remove unnecessary check for visitSDIVLike/visitUDIVLike returning a UDIVREM or SDIVREM node.

This shouldn't be possible and is a leftover from when we used to recursively call combine here.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@343049 91177308-0d34-0410-b5e6-96231b3b80d8

GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,llvm-mirror/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,llvm-mirror/llvm,llvm-mirror/llvm,apple/swift-llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm