[LoopPredication] Simplify widenable condition handling [NFC]
[LoopPredication] Simplify widenable condition handling [NFC]

The code doesn't actually need any of the information about the widenable condition at this level.  The only thing we need is to ensure the WC call is the last thing anded in, and even that is a quirk we should really look to remove.



git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@357448 91177308-0d34-0410-b5e6-96231b3b80d8

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