NFC. Updating codegen test bmi2-schedule.ll to use the SKYLAKE and KNL prefix as preparatipn for an upcoming patch to add all SKL scheduling information.
NFC.
Updating codegen test bmi2-schedule.ll to use the SKYLAKE and KNL prefix as preparatipn for an upcoming patch to add all SKL scheduling information.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@313136 91177308-0d34-0410-b5e6-96231b3b80d8

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