[InstCombine][AVX-512] Add masked scalar add/sub/mul/div intrinsic test cases that don't have a CUR_DIRECTION rounding mode.
[InstCombine][AVX-512] Add masked scalar add/sub/mul/div intrinsic test cases that don't have a CUR_DIRECTION rounding mode.

The CUR_DIRECTION case will be optimized in a future commit so this provides coverage for the other cases.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@290565 91177308-0d34-0410-b5e6-96231b3b80d8

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