[InstSimplify][NFC] Reorganize simplifyUnsignedRangeCheck() to emphasize and/or symmetry
[InstSimplify][NFC] Reorganize simplifyUnsignedRangeCheck() to emphasize and/or symmetry

Only a single `X >= Y && Y == 0  -->  Y == 0` fold appears to be missing.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@372490 91177308-0d34-0410-b5e6-96231b3b80d8

GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm