Revert "NewGVN: Don't propagate over phi backedges where undef causes us to have >1 value." It's not ready yet this was an accidental commit :(
Revert "NewGVN: Don't propagate over phi backedges where undef causes us to have >1 value."
It's not ready yet this was an accidental commit :(

This reverts r299903

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@299904 91177308-0d34-0410-b5e6-96231b3b80d8

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