[ARM] Fix null pointer dereference in CodeGen/ARM/Windows/stack-protector-msvc.ll.test after D64292/r365283
[ARM] Fix null pointer dereference in CodeGen/ARM/Windows/stack-protector-msvc.ll.test after D64292/r365283

CLI.CS may not be set.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@365299 91177308-0d34-0410-b5e6-96231b3b80d8

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