[AVX-512] Add test cases for AVX512 sign/zero extend instructions derived from the sse41 and avx2 test cases. Code will be improved in future commits.
[AVX-512] Add test cases for AVX512 sign/zero extend instructions derived from the sse41 and avx2 test cases. Code will be improved in future commits.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@283719 91177308-0d34-0410-b5e6-96231b3b80d8

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