[SelectionDAG] Allow custom vector widening through ReplaceNodeResults to handle nodes with chain outputs.
[SelectionDAG] Allow custom vector widening through ReplaceNodeResults to handle nodes with chain outputs.

Previously we were assuming all results were vectors and calling SetWidenedVector, but if its a chain result we should just replace uses instead.

This fixes an error found by expensive checks after r318368.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@318509 91177308-0d34-0410-b5e6-96231b3b80d8

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